My system is on a concrete slab floor with a fairly thick carpet/pad. My components are in a massive salamander cabinet with source components on IsoAcoustic pucks and my preamp and monoblocks on maple plinths. My speakers, Dali Mentor 6s, were on spikes. Still, when I put them on GAIA IIIs I heard a significant improvement in resolution and sound staging. It may have been that the Dali spikes weren’t really long enough to penetrate the pad and carpet, but the improvemt with GAIAs is real.
In our former house, the system was on wooden floors—the speakers were on spikes there, but the speakers sound better with the GAIAs on carpet, if my memory serves me.