open mikrotik.com > hardware > lte devices and you see the u.FL → SMA connectors. - 2x
open mikrotik.com > hardware > lte devices and found r11e-lte documentatiion to discover what pins are Main and Aux/Div for mimo 2x2 antennas.
open wAP R and see that internal antenna can be plugout and then install SMA connectors.