The ISO acoustic Gaia are pretty good but there's something that's even better called the Townshend podiums they isolate down to three Hertz and they stopped the vibrations from going into the floor and back into the speaker and your other equipment, people that have tried both have said that the Townshend podiums are on a whole different level better than the ISO acoustic Gaia they're not cheap but well worth it When I put them underneath my monitor audio platinum 200 G2 the sound improved to the point where I thought I had bought better electronics it was that significant.
IsoAcoustics GAIA
I have IsoAcoustics GAIA II isolators installed on my Sonus faber Liuto floorstander speakers on hardwood floor. I expected some improvement and I got it. Bass is cleaned up and tightened. Stage became more clear because isolators removed a curtain made by unfocused, scattered bass. Floor and sofa vibrations almost disappeared completely. And... WAF is good. GAIAs passed my wife's inspection. Is there anybody with some experience regarding those isolators?