So since you have the V2 with buttons, the source and tv can be set to Dolby.
The USB port can be the power source. It most likely puts out power when the tv gets turned on. There’s a chance it’s always on but not normally.
So that’s what I do. I have both cables connected and can operate the TVC with it sitting on the tv stand. If I want to use it somewhere else then I have other cables instead of mucking around behind the tv.