We are installing a Dahua system and customers router is in a very difficult location. In order to save some time, we would like to run all of the camera cables to one location and then one cat cable to the router. We would be using a POE switch at the camera head end then from there up to the router on the second floor with a LAN run. Have never not run cable to the NVR so my question is...is there going to be issues with the NVR seeing the cameras if they are not directly connected to the NVR?