So snaplook is a mod that can allow you with a button press to go into a certain f5 phase.
Say if I assign it to 2nd person, when I press the button it brings me into 2nd person.
And also this would probably be allowed on hypixel because it is just an improvement to f5
Edit: If perspective 360 is enabled it would default to perspective 360 but on a server where perspective 360 isn't allowed it would go to snaplook