For installations where only a handful of Power Supplies, or Power Injectors are being installed, these 12x10x5 NEMA boxes are perfect.  Compact, Pole or Wall mount, and lockable.  The inside features a mounting plate, optional 120V AC, optional Fans, and/or vented lids.  We use them often for installations in campgrounds and RV Parks, where the wireless access points are installed on remote poles, or pedestals, and these boxes house the power injectors and a small network switch.