I'm becoming a fan of Dahua products. Much of this stuff is a science project now due to the variety of models. Moving into looking at NVRs now, do you need to homerun each IP camera directly to the NVR, or can you connect the IP cameras to a PoE switch and then one connection from the switch to the NVR? There are some areas where its best to have PoE managed switch, then one longer run from the switch to my IT closet.