Geodaddi
To answer your question about the dice having to bounce before they hit the back wall. “NO” You could just hit the back wall with the dice, but if you hit the wall anywhere but right at the bottom of the rubbers where the rubbers and the felt meet you will never have any rolls but random rolls. The rubber with the diamonds were installed on craps tables to keep the game random, that is why the casinos want you to hit the back wall.
You as a dice setter will have to work on you’re shooting to where you can get the dice to land in one spot bounce once or just land, and hit the back wall right where the rubbers meet the felt so the dice do not get into the diamonds, it can be done with practice.
Most players will fail, because they will not put the time in practicing! It’s like anything else if you want to be good or great at anything you have to put the time in practicing.
Two things that will help you out set your practice rig at 29” or what your local casinos have their tables beds at. They have come out with some new tables that are higher than that now. You don’t have to take a tape measurer into a casino, just walk up to the table in question and stand right at the table then put a mark on an old pair of pants where the bed of the table is!
If you have the time to build your own rig you will be better off you can order the rubbers online and get the on-line make the rig at least 3X8 ft.
Do not count the dice that go off the rig, just as you would not count them if they went off the table, then spend all the time you can practicing. It helps if you practice your betting at the same time so it comes second natured when you are in a real casino.