I know your brain might keep saying angle, but your brain is wrong there. Even if the player is basically standing on the side of the panel (like player 3 and 4 on a dedicated Gauntlet) you STILL need to have the sticks face north.
Also, that mameroom panel you linked has the button bank angled, not the joysticks.
Here is another gauntlet legends control panel. this one a showcase. All the joysticks face the monitor.
You can trust darn near every factory built game ever made and the combined knowledge of all the experienced builders here.
Or you can listen to that little part of your brain that can't stop thinking about gamepads (and the people who listened to that part of their brain and refuse to admit they made a mistake).
You will also find that it won't matter much, your cabinet probably won't see much 4 player action regardless (unless you have children). 4 player cabinets were mostly gimmicks to convince game operators that they could get twice the income on one machine. It was rare to see more than 2 people on one out in the arcade, unless the game was brand new. When I owned 4 player machines in the past people would literally just swap out two at a time rather than all cram in around the same machine. Adults just don't like doing that.
