The hangar bolt version is what you need. As to what else you need I can only tell you what I'm using. The Mapleshade brass Heavyfeet sit directly atop a 22 x 24" maple platform (from Timbernation). Below this are four double-thickness IsoBlocks (from Mapleshade) which I happened to have already. I level the whole shebang by inserting enough thicknesses of 1 1/2 x 2" Post-It Notes (no kidding) between the top of two of the IsoBlocks and the bottom of the maple platform. This will naturally depend on how level your rack is (or whatever the turntable is sitting on).
My maple platform is 2" thick. If I had it to do over, I'd go for a 3-incher.
My maple platform is 2" thick. If I had it to do over, I'd go for a 3-incher.