I have a FTA coax (AU), but no where near my Plex server, was thinking of adding an additional Plex server running on a PI, just for DVR. Is something like this posable? Have two plex servers coexist, one dedicated to DVR and the other to normal media?
Yes you can have multiple Plex server under your one account. I have Plex Media Server installed on my Windows Desktop, Windows Laptop, MacBook Pro, and running in a Virtual Machine. So 4 different Plex Media Servers any of which can be configured with DVR setup.