While I do not own a BP, I know both my Brazilian Rainbow Boa and corn snake do not really care what position they put themselves in. They could be right side up, up side down, sideways, diagonal, etc and it doesn't matter. My BRB even makes almost 8's out of herself (with the help of my arm).

I hope that helps you, although I may be wrong and BP owners will correct me (things can be different among various kinds of snakes).