Hi Secureiam, thanks for your additional help with this.
The answers to your questions:
1. HiLook DVR-204G-F1
2. 1x Reolink Video Doorbell PoE (V1 Version), 2 x Reolink FE-P, 4x GV503T1080p-WF (thought they were Hik)
3. The DVR-204G-F1 is connected to the network.
The DVR and the 4 x GV503T...