I am building a rack (or a few) in a low cabinet to go under my wall hung tv. I plan on putting the cabinet on wheels and using a diy "z" bar for cables to the wall. My center speaker will sit on top of the cabinet and possibly my right and left (if I upgrade to a 9.2 surround). If I don't upgrade, the r/l speakers will sit on their stands. I will have 2 Elan S6 whole house amps, a power conditioner, a system controller, and possibly my AVR in one rack (left side). In the middle I planned on a slide out shelf with a record player on it and possible a vintage audio receiver/amp (not a rack). On the right side, my HTPC, blueray, cable box, etc would reside. The right side may or may not be rack, it may be just shelves.
So, here comes my questions. What type of vibration suppression would you recommend and where to use it?