For many years a homemade butcher block and 5/8" brass threaded rods on Herbies did the trick for me. No footers. Now Symposium with Rollerballs or the like,(there are others with similar function), serves me a bit better. Come to think about it the TT has zero footfall problems and it alone sits on AV Room Service largepads with one of the Symposium racks. Pretty big upgrade. Very stable.
Essentially spiked with footers, absolutely no complaints. Peter at Symposium is a straight shooter and when assembling one feels the quality and stability.
There is a thread on Whats Best Forum that is very informative as to racks, theories and the like.
Good luck, how you support your equipment is another important factor in SQ.