Can one Plex Pass and DVR account be setup on two separate servers with different types of tuners?

I currently run my Plex Server with a Lifetime Plex Pass and DVR setup on a NAS and have that using an HDHomeRun Prime Cablecard tuner. I also own a HDHomeRun Extend for an OTA antenna setup but the single Plex DVR server on my NAS can only work with one tuner because it can only pull one guide, either for the cablecard tuner or the OTA tuner. I have an Nvidia Shield Pro that can be setup to run a Plex DVR server on it and was thinking of routing my OTA tuner to it to record channels there instead but need to know if I can use my one Plex Pass to set up on both of these servers in this manner without any issues or do i need to pay for a second Plex Pass for the 2nd server to use DVR features on it.

Yes you can have multiple servers with one Plex Pass account.

Yes definitely…you could even pool the location of the tv shows/movies and have one account have all of the content