I have a dual receiver/DVR in my living room, one tuner/DVR for the living room, one tuner/DVR for kid's room. In my bedroom, I have a regular non-DVR receiver. My question is, can I purchase a single receiver/DVR off ebay or whereever, and replace the non-DVR receiver in the bedroom and it be plug and play or does it the receiver/DVR have to be activated through DISH network?