I'd suggest you consider Russ Andrews' Plug-in RF Router or even the RF Router MK 2 as this type of music could really benefit from it.
All ground wires are connected through it to a separate general power outlet or self provided earth rod if you are up to installing one.
"Russ has produced a guide explaining how to effectively ground your system: click here to download our PDF guide."
There's a recommendation to ground the cases of all equipment and a suggestion to do the same with speaker driver frames. I have extensive shielding to protect from EMI and RFI, so it is also connected to the unit. The routers are one way system, so any noise in the earth wiring is isolated and you are free from contamination. As I live in a multi level apartment complex it is a no brainer.
There's a 25% sale starting on March 30 if anyone is interested.
No I am not associated with them. Just a satisfied end user who'd like to pass on some guidance. I only know about the sale as I was given the opportunity of purchasing early.