using the Taiko Daiza's is essentially the same approach. various different impedance changes with some mass thrown in. 1.75 inches thick of solid Panzerholtz, then compressed closed cell foam layer, then a copper disc layer, then a Panzerholtz foam filled hollow footer.Just getting sources and speakers of the same floor helps a lot, mine are actually on 2 separate parts of the foundation and absolutely no connecting wood flooring.
every piece of gear has these underneath except my turntables, which have an additional Massif shelf with a ball bearing footer or 'plus' the Taiko Tana active system. and all the digital Wadax chassis also have the RevOpod decouplers, 32 of them.
all this on top of my solid wood Massif rack sitting on Nordost footers on 6 inches of concrete.
"takes a village"