Yeah, thats what I'll do. But its a little tedious because the flight computer Im connecting to has just 1 USB port. I can power the second nano through Vin from the first one's 5V out, but that may not be a a good idea when Im frequently connecting/disconnecting USB to either or both of them when uploading and debugging my sketches on PC. Sure, disconnecting the 5V each time is just a minor inconvience, nothing more. I asked the question initially mostly because I worried I was doing something wrong and possibly risk frying something.