I have one DAC in the office, one with the tv/speaker setup, one in the big rig, and one desktop setup (which is in the same room as the main rig).
The reason that I have two setups in the same room is that we have so many sudden huge thunderstorms, I keep my main rig unplugged except when I am using it. I keep the desktop setup always plugged in (GS-1 + ECD-1).