It’s more machine now than man. Twisted and evil.

This is not redneck engineering, it’s how evening is attached to walls in the US as far as I can see. An ugly hole in drywall, and cover the rough edges with trim. I’m not sure what else you are looking for.

Something outside the wall could use minimal wood working and nails or command strips.

You mention you like picture frame mounts, so why don’t you use picture frames? You can get some used stuff for very cheap at Goodwill. Or get wood trim at home depot and cut to size.

Anything that’s not visible gets the glue gun treatment.