Another variation on this is to try Herbiesaudiolab.com proprietary "grungebuster" balls to replace the original Cloud balls in this already great design.
This makes less critical the surface upon which the Cloud sits, because the grungebuster balls themselves are manufactured specifically for best possible vibration absorption, and isolation, including for a turntable upon the top plate of a Cloud.
The ninety day home trial allows plenty of time to decide if the proprietary "grungebuster" ball material really enables even better sound reproduction, justifying paying a bit more for each ball.