Summary

Use uHooks on your pegboard for easy on / easy off hanging.

uHook needs empty space of about 5mm depth, 20-22mm height, 30-32mm width. Also, it occupies about 5mm space, so for your hanging object to rest "flat" against pegboard, you'll want to add 5mm to the "back" of it somewhere down below. That is what I've done with the uhpbfh_Back.v2.stl file. It's 15mm deep at top and 20mm deep at bottom.

The file is shown here upside down. Print it like this with no supports. 10% infill is fine. Or do as you like.

Examples
Pegboard Battery Dispenser
uHook Pegboard Filament Holder
Fully Customizable Drawers REMIX

Buy uHooks: https://www.amazon.com/dp/B005A3QR2W/