I have two Teufel speakers at the back and these Klipsch speakers mounted on the ceiling at the front. It works, but if you want to point them right at you, you have to increase the angle from the ceiling. I solved this with my own construction. As they are a certain size, this no longer looks quite so aesthetic. As I did this in my cellar with studded foam on the ceiling, it's not so noticeable.

No, they can only be hung on the wall, ceiling mounting is not possible with the bracket. Unless you make something yourself, but original is not possible. They do not have a switch to change the position.