Yes, you can. But only in the same way as Mareo writes: loosen the screws, adjust the inclination, tighten the screws again.

Yes, you can, but you have to loosen the 2 screws. So it's not as simple as forward/back and left/right. So you have to decide how the inclination should be and adjust it that way.

No, movement is limited to forward/backward, left/right and a slight tilt.