Hi Dan, Thankyou for your reply.
The plan would be to connect all cameras in building 1 (approx 16 cameras) to the POE switch and then Cat6 cable straight to the NVR located in building 2 which is about 50-60 metres away.
No Camera data would be going through other parts of the network.
NVR would be the Hikvision DS7732NIM4 32channel 8K M Series.
I was concerned about all 16 cameras traffic going down one cable to the NVR.