I'm sorry about the design of our NVR. Thank you for your suggestions, I will collect them and forward to our R&D people. If you want to connect the PoE camera to a PoE Switch/injector, you can refer to the below standard to pick a suitable PoE injector/switch.
For Reolink RLC-423, RLC-423S, you need to make sure the PoE injector/switch is 802.3at compliant (48V).
For other Reolink PoE camera models, make sure the PoE injector/switch is 802.3af compliant (48V).
Note:
1. Do not purchase passive PoE injectors as they won’t work very well.
2. We recommend that you use the PoE injector/switch of high quality.