Can I share the same NBMRuleContainer between 2 BM38 servers ?

The servers are in the same OU, and, if I can't share the same
NBMRuleContainer, how can I set up the 2nd BM to use another OU ? It's
already on production (file server + iPrint)... and I'm trying to install BM
in this server, to provide fault tolerance (for the firewall).