Suspended floors are a different thing from a cement floor. Turntables with outstanding isolation are still subject to problems from footfalls on a suspended floor. For a nearly hundred years the answer is wall mounted shelves. They are made to get the turntable off the trampoline (floor)
Turntable Isolation
Im looking for an isolation base for my VPI Signature 21. My listening room is over my garage and a times my footfalls cause the table to skip. What have you used that works?