EM manuals on my games say to level the bottom of the cabinet front to back and then adjust for level side to side. The slope is built in. That's how the game was designed to be played for maximum profit and enjoyability.
As mentioned above, there may be some shots that cannot be made if the slope is too far off what it was designed for. An example is Heat Wave. You cannot make this skill shot - hit all five buttons- if the slope is wrong.
Play it how you like it or how it was designed to be played. It’s your call.
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