Also, if you want to try to use AP-277s or 274+ANT-2x2-5314 antennas for the PtP backhaul, you can. A few caveats.
* Max throughput with VHT80 is around 600-750Mbps per PtP link
* You will have to be able to deploy in an area that will allow you to use UNI1, UNI2/2E, and UNI3 outdoors AND the air be clean enough to consume all the 5Ghz spectrum with 3-4 80Mhz channels (not very likely so you will have interference that will drop the max throughput)
* We don't officially support the use of multiple PtPs to 'etherchannel' a link, though we have heard of cases where this was done. YMMV