This updated version of my original 'Wallhook' makes it even stronger than before, and featuring rounded edges that provide a cleaner look while reducing stress concentration points in the plastic. 

I have integrated two dedicated screw channels that run directly through the support arms. By using long screws, you anchor the model's geometry directly to the wall surface, significantly reducing the leverage-induced strain on the 3D-printed layers. 

I recommend increasing your infill percentage and adding extra wall loops. It is a straightforward, functional upgrade for your workshop or home organization that balances a hobbyist’s touch with improved engineering.