Sprit Level wall mount. (3cm width max)

First try and using fusion so please be nice. This is for Sprit levels that are less than 3cm thick. When i printed all seemed fine. I used PLA with no supports, but im sure any material is fine. PETG would prob be the best due to the strength and higher warping temp (around 80') so should be fine for hot days and in the van. Im always welcome for help if there is any issues or if you can see any faults with this. Thanks :)