Another thing, there are HVAC rated breakers as opposed to regular ones and of course time delay fuses. As a HVAC tech I strongly suggest a dissconnect at each of the units, I would think it to be required.
As for LRA and FLA, one is Locked Rotor Amps and the other is Full Load Amps, I would think LRA to be used in calc since the compressors will draw it for a second or two, right?