Point to Point over 4kms

Sorry another point-to-point question! I'm looking to do a point-to-point connection to a friend that has UFB and is just under 4 kms away (good LoS) - would something like 2 x Ubiquiti Nanobeam M5-400's work ok? (saw them suggested in another post), even in adverse weather? Other than masts, would I need anything else?

Alternatively is there anyone in Upper Hutt/Wellington that installs Ubiquiti?

Thanks,Matt