Outdoor AP mounting

[patrick_duffy_9]

I am going to be mounting several T610 APs to cover the public areas surrounding a commercial office building.  Electrician has provided CAT6 cables pulled to 2 gang (square) electrical boxes.  My question is how do you mount to a box like this?  Every mounting example I see for these APs is to a pole which does not apply in my situation.  Some of these boxes are ceiling mounted and some are in the face of the building.  If anyone has photos of a similar situation, that would be awesome.  Thanks in advance!