PLA or PETG for shop light mounting brackets?

I'm planning to print up a bunch of brackets to mount LED shop lights (very similar to these) to the ceiling in my garage. My plan is to use an upside-down "U" shape bracket that screws into a joist/drywall anchor in the middle and then sort of clips around the sides of the metal frame.

Maybe filament type doesn't matter much here, but I'd rather not come out to one of the lights having fallen on my car if I can help it 😅

I think the main considerations are just temperature and stiffness. It can get up to about 85F in the garage on the hottest summer days, and probably a few degrees warmer by the ceiling. The lamps are cheap LED tubes, so the metal housing only gets slightly warm to the touch (say 90-100F or so). I know PLA is a bit stiffer at room temp, but I'm worried it might soften too much at the worst case of warm temperatures.

Any thoughts on PLA vs PETG for this situation?