Can I Use One Monitor To Display 3 NVR (Dauha 7216) ?

Our church bought 3 NVR, each serves 8 ip cameras at each zone. I would like to display the 24 x h.246 streams on one monitor (3x8), how can do that? Is this function of the VMS software or do I need something else?

You will need to run their Smart PSS client software. It allows you to connect to multiple recorders and view cameras from each simultaneously. It's fairly simple to use and for limited mostly passive monitoring like this it should work fine.