How to adjust Z Axis

I wanted to adjust the Z Axis, as it’s not perpendicular to the bed (meaning it’s slightly slanted).

Would tightening the wheels (for instance the top wheels) bring the top of the Z axis in a bit?

I encountered this issue while tramming.

What adjustments can I make that would allow me to bring the router holding/router fwd/back?

I have read many posts and saw videos, but wanted to know if there are specific places to adjust on the machine.