I added the Gaia II under my Whatmough P33 signature speakers sitting on a floating wood floor. I found they opened up the soundstage resulting in a perceived improvement in the clarity of vocals that normally sit centre stage.
They do have a suction cup type effect which sticks the speaker to the floor and allows some alarming movement left to right. This makes it harder to move the speakers around but also makes it far less likely that anyone can ever accidentally knock them over. A definite bonus for tall, narrow speakers like these.