camera ip

I am working on a big multi-tenant building and will be using 4 8MP cameras, and 49 4MP cameras. (30 days recording, h.265, 25 frames) I am trying to find out what is best way to choose an NVR, because I don't want any performance or recording issues. for example, I was reading Ds-9664ni-m8...

I have a total of 8 cameras (2mp-1080p) and 1 IP (2mp-1080p), (its model is DS-2CD1323G0E-I hikvision) when I see all the cameras at the same time (sub-stream) my IP camera looks very bad, then I look at its configuration, and it puts a very low maximum Bitrate between 30 and 100 (attached...