Best isolation platform for a turntable with suspension?

If you have not come across the CS2 footers from Critical Mass Systems, it may be worth your while to do so.  I have used almost every vibration reduction tech around.  These make the rest look like toys....let's say in my opinion it's not even possible to make comparisons.

Downside: they take 300 hours to 'burn in'
Sound awful first few days, till they settle into full isolation mode for your specific room/equipment.  I don't understand how this happens, it's something to do with entropy!

Once it does though,  it's as if you suddenly doubled or trebled the money spent on your system.  

Apollo based in the UK makes a nice turntable shelf, both single and double. The double provides an additional shelf below for a phono preamp or what have you...they are built using heavy duty welded steel with your choice of glass or wood for the shelf/shelves. My single is mounted to an outside wall in basement which is concrete covered in 2x4's & drywall. Zero vibrations and footfalls. They are not too expensive, look nice, and work well. 

Mass loading a target vw1 turntable shelf with marble also works fine. 
Occasionally can find used if necessary.  You asked for best so this may not be appropriate. 

I used a wall mount many yrs ago just awful results. While playing music with bass just place your hands on the wall where your wall mount would be and "feel" the vibrations. Even if placed in studs did not help YMMV