Hi Byron,
OK, sorry had to look into this a bit more. It is not generally possible for you to bridge two unconnected networks with the single VMAN appliance. However, VMAN has Federated Collectors. You can think of these as Orion pollers (there are some technical differences, but the mental model works), except that we don't charge for these within the VMAN licensing scheme. You can deploy as many FC's in your environment as you need, usually one per geographic datacenter.
With that said, it would be recommended that you deploy the vApp in one network and a FC in the other. As long as it is possible to create 1 route between the networks, this should allow for monitoring of VM's on each network.