Definitely not cheap, but I'm using the SS Ultras under my Verity Parsifals to good effect. Try out a set from the likes of the cable company, and send'em back if they don't float your boat...? (That's what I did, and I kept'em.) No experience with your speakers, so there you go on that front. But I have found generally that running some form of isolation solution between any speaker and a suspended wooden floor often makes a big difference. Whether you feel it's a positive or worth-while difference is often personal, but I'd expect a difference.
Stillpoints and Wilson Maxx II or III speakers
I have read many great reviews of the Stillpoint products. The manufacturer told me that the greatest benefit of their products is when they are used under speakers. I would like to hear from anyone who has tried Stillpoint Ultra SS or Ultra 5s under Wilson Maxxes or Alexandrias. Considering the materials used and internal bracing of Wilson speakers, I am curious to know how effective the Stillpoint products are when placed under these speakers. I own Maxx IIs and they are currently placed on a suspended wood floor. Thanks.