iPhone 13 Inductive charging bracket for Megane E-Tech

In the Megane phones tend to slide around in the inductive charger. This causes a charging error, which then leads to a stop of charging. That's very annoying. So I designed this little fix for the problem. I you like it, use it, if not, be kind... It's my 2nd ever attend in using CAD software.

I printed it with 15% infill in (very cheap) PETG, which should stand the summer temperature in cars...

If somebody tells me, which format is the most common for CAD files (there is no .scad), I can export upload it to modify it for other phones.
I'm using XDesigner (Solidworks). I'm totally new to the game, so I don't which one to use best.