Turntable platforms

Another option if you can swing it would be custom Minus K.

Conspicuously absent is the Townshend Audio Seismic Platform (or set of four Seismic Pods).

If you have a suitable mounting point such as a sturdy beam, hang it from the ceiling. 

The platform can be a thick, say 5cm plywood or butcher's block. Metal might also work.

This offers almost complete lateral isolation, and with a little tweak to the cables, vertical isolation. 

millercarbon says,

Symposium and others pretend to do isolation. Really impossible, ultimately all anything can do is control vibration. Damp, tune. No such thing as isolation.

>>>>Are you channeling Michael Green again? You don’t even know what isolation is, do you?  Remember what the Little Train that Could says, “I think I can, I think I can...” Toot, toot! 🚂 

If you want to go all out get a Herzan. Otherwise Stacore, Vibraplane and minusK do a very good job.