Created this clip to keep an extenion cord tucked nicely against the house. Used a Dewalt carbon fiber composite staple gun for attaching these, so designed/spaced for these staples. The front of the staple gun goes up against the wall on the shelf, and center side to side. I gave it a little slack to allow for "aim" to be off a little.

STEP file attached in the Raw model files to modify to work with other staple guns. Print in orientation in .3MF