[Racer26]

that Q&A response doesnt really say you cant use a 'spring-loaded' mount, such that when not being impacted by a ball, the holder is vertical.

EDIT: found one that says they want it approximately vertical the entire time... much as it seems silly to me, because to have it rigidly mounted in a vertical position will result in launched trackballs being able to hit it. This may result in the launching/breaking of flags. A spring loaded mount would surely be safer.