OMOTON Tempered Glass Screen Protector
The highest rated tempered glass protector for the Amazon Fire 7 (2017) and even older models, comes from OMOTON. If you're looking for the best protection, this is probably it.
You'll only get one screen protector in this package, but one that is designed to completely keep your tablet safe. It's laser cut, has precise cutouts for the front camera, 99.9% clarity, 9H on the hardness scale, and it's really thin.
OMOTON claims they use thin yet durable 0.26mm glass, that's thinner than most for improved sensitivity and touchscreen responsiveness. Whatever they're doing it works because reviews are all positive.