I might be reading your question differently. The red connection (UTM or appliance) uses the hostname you provide in the configuration when the red is created in the UTM. So when you have both utm's with two uplinks each, you can have the UTMs create RED circuits to each. I've included a sketch of what I commonly do in this circumstance.
I might be reading your question differently. The red connection (UTM or appliance) uses the hostname you provide in the configuration when the red is created in the UTM. So when you have both utm's with two uplinks each, you can have the UTMs create RED circuits to each. I've included a sketch of what I commonly do in this circumstance.