More thought on this decoupling business.
Many TT manufacturers go to some effort to try decouple their TT's to minimize mechanical and airborne vibration from getting to the stylus so it makes sense to decouple the speakers, especially the typically, lighter weight, speakers most folks buy. (Might not include speakers like Wilson Whams or Focals TOTL which would have a lot mass and may have minimum load bearing floor parameters and there will be nothing you can do to decouple them
).
I also wonder if speaker manufacturers design a "sweet" spot range of heights for listening based on the distance of the driver(s) array from the floor necessitating listening seating with adjustable height or a listening room with a sloped floor, when placing what looks like substantial added height underneath with these speaker isolation devises?