FAN-612R how to connect to FAP

I'd like some clarification on connecting FAN-612R to FAP-222C.  The FAP-222C has 2x 2.4GHz and 2x 5GHz connections.  The FAN-612R has 2 connections.  Must I always group the same FAP frequency (2.4 or 5) to the same FAN, so to cover one area with 2.4 and 5, I'd need FAN one on 2.4 and FAN two on 5, both pointing same way?  Or can I mix with FAN 1 (2.4 and 5) covering one area, and FAN 2 (2.4 and 5) covering another area?

Thanks