Camera alignment light problem

What should I do when I only use 4+1 scrap material to align the camera not a blank sheet of wood?
It costs a ton of money.
I have 2 lights in the machine. 1 at the back side and 1 on the bottom of the X rail.
In that way, the camera is totally burned out because the main area is just the black bottom of the machine. I try to shade the position marks and move the X rail, but it is a disaster.

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