@goofyfoot in my opinion, the most critical thing to isolate is the turntable, then anything with vacuum tubes (mainly because it helps them to last longer) , then speakers (doing this is like treating the room and your gear everyone benefits), then your choice, as to me isolating solid state DACs, Amps, and preamps is alike power cables and HiFi Ethernet switches and cables. If you want and makes you feel better then do it, but by electrical definition they can't make any difference if they meet the appropriate specs. I buy expensive "HiFi" power cables just because they sure make an esthetics impact but I consciously know that they cant change the sound as they are completely different domains.
What are you trying to improve? What components?
I do not want to start a war here, if you want to discuss further send me a message please.