I am a new Valk owner (and new to this forum) and was posed with this same question. Being an avid Winger, I am a bit of a wuss when it comes to wind and head buffeting and decided to start with the 20 incher with their brackets.
By using their brackets, I can create a myriad of positions that allow me to either look through or over depending on what I want.
I am 5'9" and set the screen so the arms are pointed more horizontal creating a more upright screen and thus I have to look through it. But my ears are happy!
I did try it in lower settings and can create a combination that I can see over the top but with more turbulance.
See my attached pictures for clarification.
Cheers!