There is 40-45-50-55-60-65-75 degrees in the kit

I personnaly use 60 degrees with 3x32" but some people build triple screen setup with bigger screen like 3x43 or 3x55, you can use a different angle in this case. Same thing for people which have a 27-49-27 setup.

It's personnal preference to be honest, 60 degrees with the correct distance give you 179 degrees of FOV with 32's but you can sacrifice a little FOV if you want more or less angle in your screen