The bolts adjust camber. The bolts are not for toe adjustment.
Excessive toe can cause the tires to wear on the inside. Toe is adjusted by turning the tie rod to shorten or lengthen as needed.
If you bought only two adjustable bolts vice four it would be best to place them in the forward bushing on the A frame. One bolt per left and one bolt on the right side of the car.
Excesses tire wear on the inside can be caused by too much negative camber (the bottom of the tire is pushed out too far). To correct for this you use the bolts to pull the A frame inward.
DO NOT TURN THE HEAD OF THE FACTORY BOLT!!!! ONLY TURN THE NUT!!!! Ditto with the Adjusting bolts. It is obvious once you have it apart.
Read those instructions all the way through. It is not a job to be taken lightly. It may be best to have the alignment mechanics do the job and then they can do what they can to bring your camber and toe into specification. ADVISE THEM IT IS A MERCEDES TYPE SUSPENSION AND THEY CAN NOT TURN THE HEAD OF THOSE BOLTS, ONLY TURN THE NUTS!
I install the bolts with the head forward and the nuts to the rear of the car.
Once the bolts are installed they will not need to be adjusted. They are set to either move the A frame in or out, and in your case you want to move the A frame and thus the bottom of the tire inward.

I think that answers your questions. You can't just pull the original bolts out and slide the new bolts in with the front of the car jacked. They are under tension from the suspension. You need to able to control the inward and out ward force to get the new bolts placed properly. Read those instructions all the way through before starting the job.