Since the Orion Server has already been offered (and accepted) a DHCP lease from the one of the two DHCP servers within the same subnet, it's my belief that that other DHCP server will not make an offer to the same host with the same MAC address. For this you would need a second network interface in your Orion server and need to configure the "Sender Adapter IP Address" option in the DHCP User Experience Monitor uniquely for each DHCP server you wanted to monitor, so long as they're servicing the same subnet.
