Disable DHCP On Hikvision Ds-7716 NVR ?

So, I have looked, but don't see anywhere in the firmware to disable, or even control the IP scheme that the POE side of the NVR uses (for the cameras). I would like to try to put 3 NVR's onto the same subnet so that I can add a MILESTONE VMS to see all 40 cameras..

Any thoughts / suggestions ? Thanks!