outdoor wifi extension

Hi there , I have an ORBI 6 RBR850 router with 2 satellites- all works fine. I am setting up some cctv cameras and due to the thickness of the walls the wifi strength is very weak on one aspect of the building; so I want to increase the strength with an OUTSIDE extender or booster

I have seen the wax610y

Is that any use or can you offer any other suggestions?