Under speakers, Townshend Podiums. Search the comments, several have compared and gone from Gaia and other stuff to Podiums, there is no comparison. Expensive but worth every penny. Under components, Townshend Pods. You will get better results directly under each component. But they do make them for racks that can support a large load. I put them under my turntable rack, that is about 750lbs. To touch that massive rack and see it gently sway at about 1Hz is really something! Yes both the components and the rack are on Podiums. Before that it was Nobsound springs. Before that BDR Cones, and too many other things to list. Townshend is the best of the best. Nobsound are extremely good for the money. In between is a lot of stuff that costs a lot more than Nobsound but really isn't much better, if any.
I mention this because the mistake I see you about to make is you think "middle of the road" means buying the stuff in the no-mans land between Nobsound and Townshend. When in fact what will work much better is a mix of Townshend and Nobsound. Those are so good for what they cost it isn't even funny. So you put the speakers on Podiums, the rest on Nobsound. Or some other similar mix.
I mention this because the mistake I see you about to make is you think "middle of the road" means buying the stuff in the no-mans land between Nobsound and Townshend. When in fact what will work much better is a mix of Townshend and Nobsound. Those are so good for what they cost it isn't even funny. So you put the speakers on Podiums, the rest on Nobsound. Or some other similar mix.