Hey hilroy48...thanks for the inquiry,
Long ago, in the wilds of Maine, the rig was on a jouncy 2nd floor apartment surface, sourced with a fully fleshed out Sota Star Saphire TT. After several attempts including bladders, footers etc., my solution was a box filled with play sand and an added Maine block of granite atop the sand, carefully leveled. I suspect any deadening plinth will work. Cheers and onwards!
More Peace, Pin (Bold print for old eyes)