We did some tests with this but didn't get it to work.
As this is coming from a cluster, so the VMs could be running on any of a number of hosts, we specified a virtual ip address.
This virtual ip address is sourced from all the hosts and can't be pinged, therefore it shows as down in Orion.
We did see interfaces showing up, and added the interfaces but it was as if it didn't accept netflows from a host that was down.
Have you tested NTA with a virtual distributed switch?