In case you're wondering, since it's not stated in the manual:
The notches for setting the FPV Camera angle are 15°, 30° and 45°.
There you go, Internet, now it's documented forever 🙂
I fly 30° personally, since for freestyle I think 45 is too fast and 15 is so incredibly slow, you're almost not moving forward at all.
Have a look at my FPV Freestyle Videos on YouTube if you like!