I've recently purchased a Night Owl NVR (model NVRH5-4BU-842). Its an eight-channel 4k-capable system which included four PoE camera.
I have a Amcrest Pro 4MP PoE camera (model IP4M-1025EB) which works fine with the NVR. Granted, it was not 'plug and play', but after playing around I got...