A5c and Distance

Hello everybody. We need to deploy a small network (less than 10 clients) and we’d like to use A5c cause of performance. But … we have AP located at 6/7 km of distance (it’s the only LOS point for all clients).

I love RF Elements antenna but they are note MU-MIMO, so I could use a MTI sectorial antenna.

Could be a good choice? Or links are too longs?