my buddy has had good success with the ART plates atop his MSB gear. also beneficial under power conditioners.
that said
when he brought them over here, they did nothing to my dream dac nor my vitus. no audible change.
i suspect it has a lot to do with how differently he and i approach ground conditioning (him: one all in one box, me a dozen component-specific ground boxes).
there's no tweak that's a slam dunk in every installation.