I have my full system running through the P20 including two turntables. I cannot find a ground connector on the P20. Since the p20 is like a separate power station should there not be a ground connector on it?
In the past I’ve used one of the screws at the back of the unit.
Unscrewed it a bit and wound the ground wire around the screw and re-tighened it again.
Pretty sure I checked with PS Audio at the time if this was ok.