Plug and cord hook, low profile:
https://www.thingiverse.com/thing:3723366
Simple perpendicular plug with cord hook:
https://www.thingiverse.com/thing:230595
Box cradle with plug, 2 parts:
https://www.thingiverse.com/thing:1122203
Outdoor cabinet:
https://www.lowes.com/pd/vevor-Steel-Electrical-Box-16-x-12-x-6-inch-Electrical-Enclosure-Box-Carbon-Steel-Hinged-Junction-Box-IP65-Weatherproof-Metal-Box-Wall-Mounted-Electronic-Equipment-Enclosure-Box-with-Mounting-Plate/5014065289
https://www.lowes.com/pd/vevor-Steel-Electrical-Box-12-x-10-x-6-inch-Electrical-Enclosure-Box-Carbon-Steel-Hinged-Junction-Box-IP65-Weatherproof-Metal-Box-Wall-Mounted-Electronic-Equipment-Enclosure-Box-with-Mounting-Plate/5014065279
The first part looks outdated, but the mounting instructions might be helpful.
includes adapter for 2" receivers
This might actually work for SHAC.
Can this be mounted in the wall? Is it legal for UPS/etc to use it?
I like the idea of small bungees for the straps, instead of zip ties or cutting holes for velcro that's hard to thread through.