Isolation devices- to use 3 or 4 footers?

Innuos uses 3 footers. Maybe there is something to it.

I prefer having four feet on my gear that isn't rack mounted. But consider that it's the three-legged stool that never wobbles. It's why photographers use tripods.

More effective, or sounds better?
I find 3 sounds better on my Garrard 401 tables. 

I use 4 footers on my Preamp and 3 footers on my Amp because my manufacturer used 4 footers on my Preamp and 3 footers on my Amp.

That being said, I slightly off-set one of the footers to help mitigate any tiny standing-waves that the electronics transfer to the Aluminum casing (which, in-turn could be reflected back into the electronics). 

I use inexpensive footers, and they seem to work very well (converting motion into heat) - the improvements are obvious, not subtle.  My system is posted.  

My only advice may be to start with something inexpensive and see if you are satisfied before going high-end.  If the inexpensive footers are not satisfactory, expensive isolation footers will work very well (from all reports).

Very few components are physically balanced. I place one directly under the transformer (typically the most vibration to drain) then 2 or 3 more depending on weight/size of component

FYI A couple weeks ago I replaced el-cheapo iso devices from Ali-E with Very Black Hole devices from VeraFi Audio LLC to fabulous affect. Now have the huge life like 3D sound stage Great price $199/4. They have lots of cool stuff at great prices