Use the screws to mount it to something solid, and high enough to remove the lid. The edge of his play tower worked out well. If you need to I’m sure you could mount it to the wall with a block of wood.
Training was pretty easy. Show your cat that food will fall each time the ball is pushed or pulled down. With Apollo, it took one time. One problem I did find is he will pull the clip off the top dropping the ball, but only when he runs out of food.