The MA-MNT-ANT-2 is for mounting of antennas not an AP.  the best way to mount any AP is horizontally suspended from the ceiling  between 9 to 15 ft height from floor and below any obstacles like lighting fixtures architectural elements, ductwork beams etc. If you have open celling's then use conduit down rods to a single or double gang box onto which you surface mount the AP mounting bracket.   ... View more

Yep, connect one ANT-25 antenna to both the top ports, and another ANT-25 antenna to both the bottom ports. The difference with the MR84 (being a 4x4 access point) is that all the ports are dual band (so both 2.4GHz and 5GHz) and you want to have the antennas covering the same area so that all the smarts of 802.11ac Wave 2 work as expected. ... View more