432F & External Antennas

Hey all, curious about adding a 612N to a 432F.  Looking at 432F guide, there are five available N type connectors for the radios.  I need to shoot 2.4 and 5ghz out over a field where the client density should be low (10, maybe 20 clients at busiest).  What I can't confirm is, do I need a 612N for both the 2.4 and 5ghz radio since the 612N can do both 2.4 and 5 in the same radome?  Would I just connect one N connector to 2.4 and the other connector to the 5ghz radio?   OR, do I use one 612N for 2.4 and then another 612N for 5ghz.  Apologize if there's documentation out there that covers this, but I sure can't find it.

Thank you!!