I cut pieces of 1x2 the length of the box, and then screw into them with 1/2" screws from inside the enclosure. You can add a dab of silicone if you like (I never had a problem).
Then when I set them up in the yard, I drive a 3' U-picket into the ground and then screw it into the 1x2 on the back of the enclosure.
(note: That price is OUTRAGEOUS! I only linked there because I could find one quickly. Your local Home Depot should have them for about $2)
Unfortunately, I don't have a pic of a mounted enclosure. I do the same kind of thing for my cutouts. Here is a picture of how that looks.
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