Automatic parking timer privacy shield

I bought a "Needit" automatic parking timer but I don't like it that everybody can see at what time I parked my car if that's not needed. So I designed a small shield that slides over the timer and can easily be removed when necessary.

I printed this in PLA+ but I have no idea how this copes with the hot French sun in summer, however, I do know normal PLA MIGHT MELT in direct sunlight behind the windshield!