Have them under my focal maestros - a massive upgrade that you would not believe. I recently moved house and set up my kit in a new room. I had not installed the stillpoints as I was adjusting the speaker positioning. The system sounded muddy and I could not figure what was up. I was getting annoyed with the new room thinking it was awful. I put the stillpoints back on when at the point of thinking that I was going to need some room treatments and everything snapped back into focus. The floor in the new room was less than ideal - floorboards that were resonating. I assume that the stillpoints decoupled them from the floor. I would strongly suggest an audition. The ultra 5s are even better - audition at your wallets peril
