For me it is up and down, I try to limit the vertical head movement and wouldn't want to look high up. I am using up to 3 screens horizontally, that is quite fi

For me it is up and down, I try to limit the vertical head movement and wouldn't want to look high up. I am using up to 3 screens horizontally, that is quite fine. Though I am using mostly the "middle" display and put less used stuff on the other screens (mail, chats, reference documentation)