Lifters ForGetting Cables Off The Floor, Worth It Or Snake Oil

Better yet, hire a contractor to remove the floor entirely and install a couple of catwalks that allow you to walk to and from your equipment rack.  The results will be amazing I assure you.

Gee whiz, can't there be some kind of like firewall to keep the Pro Audio guys away from the High End guys? You know, somewhere where all the Mogami and Crown and "let the vibrations be free to roam around" crowd can hang out.

Funny thing is, I used a crown class d pro amp to good effect until a few months ago. Guess what? That system sounded better with vibration control on the rack, turntable, preamp and speakers. Pro audio gear can show improvements in performance when vibration control (and cabling) is well applied.
Pro audio in a performance venue setting shows these improvements less clearly or not at all often because of the high volume often used as well as the large spaces of many venues. Hopefully a noisy crowd too!

Abrew how deep does the trench need to be? I’d be a bit concerned about the foundation, wouldn’t you? Would definitely require a structural engineer to do the calculations and further analysis to determine pro/con. Sure would make for a great rabbit warren though.

foundation???

any audiophile will have drilled into solid granite for a foundation

you may be a mud-fi type listener