I'm with Slipknot1, the BoosBlocks are what I'm using (on top of certain shelves, depending on component)
I coupled them to my 3/4" acrylic shelves with a dab of Mortite (rope caulk) on each corner and one in the middle, then set the block in place and pressed it down, till it was firm and even, then let it set up.
I coupled them to my 3/4" acrylic shelves with a dab of Mortite (rope caulk) on each corner and one in the middle, then set the block in place and pressed it down, till it was firm and even, then let it set up.