Do you use the risers/clips on your keyboard? I know that many gaming keyboards don;t have risers because for some reason it's not included. But some keyboards might be on an angle that you like even without using the risers. Risers/Clips on your keyboard is the thing that raises your keyboard at an angle usually for you to type better or something like that!
Depends on the angle of the keyboard. For most of the time yes, but I don't need them on the keyboard I'm using right now.
The only reason I raise my keyboards if I'm on a laptop to prevent the fan from overheating. Otherwise, I don't use them.
I prefer my keyboard flat on the desk. I feel that it's more ergonomic that way. I don't need to worry about being able to read the keys as I'm a touch typist.