I did nano ceramic tint 35% rear windows and back, 70%front windows and windshield, and 5% (basically blackout) on the sunroof. Massive heat reduction, love it. I live in Los Angeles so it’s hot and sunny most of the time.
I really like the tint I used, it was Rayno brand nano ceramic. But most important is to trust your installer and just use what they recommend and who they have a relationship with in terms of experience and warranty. My shop uses Rayno but there are other good brand also.