@TANSTAAFL i think this question may be answered in your post, but I didn’t fully understand the DVR VS NVR part so I wanted to clarify.This is more or less the same setup that we have. We bought ours from Costco.
Lorex 4K Security Camera System, 8-Channel 2TB DVR with 8 Analog Wired Active Deterrence Cameras https://a.co/d/cubSTL4
If I understand correctly, the power is fed through the wired connection, correct? So it all feeds from the box it’s connected to?