It seems that we can only add one proxy per REALM or RDNS as RDNS is based on domain, the rest is what we can set per subdomain. This is not very usable if you have multiple locations and want to create independent locations with independent proxies.
Not really expected but it would be nice to be able to create multiple ones, or one per location.
Foreman and Proxy versions:
Foreman and Proxy plugin versions: