Boy, Oh Boy! Towshend!

Understood. So placing the isolator under the amp is best.
As far as the Rogue tube phono stage and Vertere motor drive, they will be set close to each other in a rack shelf. Seems like the most economical thing for both is to put both on a Symposium Segue ISO platform. And a consideration is, that platter will be what separates both components from my Classe SSP-800 processor/DAC in the rack space below them. So the ISO platter will block any vibration etc from the Classe, if that does in fact happen.

Although come to think of it, a Townshend platter would likely work as well provided the pods can be centered on the racks steel bars; whereas the ISO platter is flat across the bottom and will certainly sit on the bars.

I was hoping to put isolation under the Classe but there is only 3/16" of available space above the top of it.

The space is much greater than 3/16". The true available space is from the shelf it sits on to the actual chassis bottom. Most components are on factory feet that are at least 1/2" high. So it gets tight but you really probably have about half an inch available. This is probably just enough for some Nobsound springs. I mean just the springs. Not the whole setup with the footer holding the springs, just the bare springs alone. 

Best part about this is, won't cost you one thin dime. Get your Nobsound springs for the motor or whatever, you will have some springs left over after setting them up for that load. Take the leftover springs, squeeze them down and put them one at a time under the Classe. Start with one in each corner, just keep adding until the thing starts to float. Could be wrong but I bet there is just enough room for this to work. Don't cost nothin' but time. What have you got to lose? 😉

@vinylshadow - see what Peter at Symposium says about the amps. I have my amp and phono stage on Roller Block Jrs because they drain and isolate. He calls everything vibration control, because that is what you are doing in either situation.

Since my components only weigh 11 and 29 pounds respectively, the Jrs, work and I only need 3 of them each. 3 points define a plane and will provide stability. 

Now, just to muddy (no pun intended) the waters, as MC says, there is always more you can do. You can put a platform under or on top of the roller blocks, depending on the situation (under for turntables and amps, on top of for speakers) to add additional treatment. It is not black and white, and you can go all the way up to platforms that are the most effective that cost > $2K. There are even levels within the roller block types by changing the bearings. They have increasing levels of purity and performance. I think all his roller blocks now are being delivered with the mid level ones made of Tungsten Carbide, and you can get what he calls super balls that have purity down to the millionths of the particles. Even the Tungsten ones feel incredible solid and perfectly spherical.

To give you an extreme example, a friend of mine (who happened to introduce me to Peter) got a very expensive turntable and he asked Peter for the ideal treatment for it in his situation. He has the big Roller Blocks with the super balls on top of a Segue platform sitting on top of a Segue Iso platform. In my mind, severe overkill, audible difference with each additional treatment, perhaps, worth the 5-6 times the cost of just roller block jrs with the tungsten carbide, not in my mind. But Peter calls that set up perfect, and that's what my friend was aiming for. I don't know how many thousands he has spent on vibration control with Symposium and Townshend (probably 1/2 of what my TOTAL stereo investment is), but he tells me he wishes he could do more, but is limited by the vertical space where his components are placed. Everyone (except maybe Mike Lavigne) has space, spouse who limited my acoustical treatment options, or financial limitations. As Clint Eastwood says, "A man has to know his limitations".

Bottom line, ask Peter for his opinion for best bang for the buck for everything you want to do and he'll ask you questions about the environment. Then he will give you options and recommendations and his best combo deal and save you some money shipping it all together. However, as he told me, most people start with one thing, are pleasantly surprised and keep going on and on. He told me one guy yelled at him because he had to keep buying. That why he even sells bearing upgrades from basic to Tungsten carbide to super balls. You can go nuts with this stuff, but as long as you can appreciate and afford the improvements, go for it. I went from turntable to speakers to phono stage to amp. Power conditioner is the only thing that doesn't float on my wood credenza (wood is best for vibration drainage under a platform or roller blocks) or wall shelf for my turntable. I don't want to have that floating because I use it to put records on when sorting them and when the components move when I touch them,I see the wires move in the back and it makes my OCD tendencies flare up, even though they stabilize almost instantaneously. Seeing all those power cords moving would drive me nuts. Plus, some wires are very precariously positioned in the back and moving them in some cases can make my speaker cables move and hit the floor. A big no-no.

Good luck and enjoy the dramatic improvements.

I have a question for someone knowledgeable about the Townsend Corners for rack isolation. I was told by a dealer that if I bought the corners for my rack, I wouldn’t need to upgrade my twenty plus year old Target rack. He stated the Corners would be all that I needed. For those who have tried the Townsend Corners would you agree or disagree with this comment? Also my Target rack only has three legs, so would this matter at all?

@sidog1460

I can help. I just ordered the Seismic isolation corners(and speaker podiums, turntable platform and pods) from John at Townshend.
I wouldn't think the 3 legs would matter...You can email John at Townshend if you want. He is so helpful.

Your dealer is correct. The isolation corners will "float" your rack and isolate your components and your rack from external vibrations down to 3Hz. That would be adequate to stop right there for many people.
However, I am taking it one step further in that I will be placing pods under all components(and my sub) to isolate all individual components from internal vibrations.