Create a cable mount/bracket/clip for a corner with a single side for mounting or both sides for mounting. Adjustments for nail size used (if at all). thickness of the bracket. cable diameter, total height, and wing width.

Uses OpenSCAD to build. 

For mounting USB cables, I've found a single-sided bracket. Nailed in with a size 8 sequin pin (for sewing) works wonderfully. And the hole it leaves is so tiny you'll never know it's there if you ever remove the cable.