I've set up the following:
Denali and DPC-6 are both plugged into a single 20amp receptacle.
Denali - grounded Spectral preamp / two Spectral mono blocks floated / a dCS DAC also being floated (current DAC Berkeley is floated)
DPC6 - Upsampler (dCS) floated / Roon Nucleus / WD USB drive /...