Timely discussion. When I dropped my truck off this morning for PPF, ceramic coating, and tint, I was advised against doing the sunroof. They said they do it all of the time at the customer’s request and that it would likely be a nonissue, but they wouldn't warranty the work. The film soaks up heat, which can cause the glass to crack, even with a 70% film. He showed me a couple of pictures.
I just did my windshield at 80% ceramic. I inquired about the sunroof and got the same answer. I don't think it is worth the risk. Just do all windows and windshield and that should be enough to keep the car cool while driving without having to put your fan at 10.