lowrider57,
The Audioquest Niagara is sitting at the bottom of a Stand Design rack. This rack not only has spikes at the floor (that I have Herbies footers underneath) but there are also spikes underneath each shelve.
Yes, I have the Iso-Acoustics GAI 1's underneath my speakers.
The Critical Mass footers really are amazing though, I have them underneath my Lumin X1 and Carver M350 tube amps. They are expensive, but they really do perform well in these places.
Just not sure about under a power conditioner.
ozzy