Isolation for power line conditioner?

I have heard that many gain good results by providing isolation for their PLC units and was wondering what type of suggestions/experience folks out there may offer. I do currently have my line conditioner (Sound Application XE12-S) on a slab of MDF on aluminum cones. I put this together awhile back for the PLC I had at the time, and chose this route simply cuz I had the stuff lying around and it seemed to be better than nothing. That aside, considering this particular unit is, I believe, primarily a passive component, what solutions and ideas can you throw my way? Thanks in advance!
Thanks all for the input on the topic. When I used the word 'isolation', I suppose I was incorrectly using this as an umbrella term and was really looking for ideas on how to support the PLC, whether it be coupling or decoupling. And BTW, Warrren, I do appreciate the tips/info you passed along and I will say that I have looked at the Sistrum stuff in the past and have wavered on the edge of picking up one of the platforms here on Audiogon a couple times. Perhaps I'll take up Stehno's idea as a good starting point, and will seriously consider taking up Starsound's home audition offer as well. I've messed around with a few 'isolation' tweaks in the past and it's been rather interesting. I'm a pretty big fan of the Art-Q damper blocks to a degree that I simply consider them magical black squares...components of some strange alchemical process. I've got a Symposium platform under my amp that seems to work nicely, but with the consideration of the line conditioner as a passive unit (not even a buzzing transformer), I was a little stumped and looking for some direction.
I could be wrong, but I doubt adding isolation or coupling to your passive power line conditioner will have any effect on the sound of your system. I notice that of the above responses nobody has actually said it made a difference in their setups.
I have used Symposium Roller Blocks with Tungsten Balls under my Hydra and it does make an improvement. I have no idea why it does or why it should. I only know what I hear.
Jim Weil, the designer of Sound Application, has worked extensively over the years to try to limit the effects of mechanical resonances on his passive line conditioners and he is never fully satisfied with their immunity. This is a testimony to the fact that passive plc's sitting on the floor are subject to micro-shaking, resulting ultimately in some smearing of the audio signal. Whether isolation devices help more than they hurt is another question; I've never found external treatments to be overly helpful.
A related comment - I've often found the passive network boxes on networked cables to be quite vibration sensitive. Setting them directly on the shelf of a rack has resulted in very audible smearing, which is eliminated by hanging them or attaching them to the wall.
This is a subject I would really like to understand - and don't.

I continue to disagree with Stehno. Floorborne vibration is a far bigger problem, especially on raised hardwood floors, than airborne. The surface area of a network box for airborne interactions is small.
It does make a significant difference. Those airborne resonances have the same deleterious effect as those microphonous meanies in amplification and the like. go figure. 'tis why I go for coupling. Attainable. And all resonances go to mother earth. Even from ICs, power cords, and particularly, my Sonoran speaker cables. peace,warren