Help with fence construction on old foundation

Hello, I try to do as much as possible myself, but I try to inform myself thoroughly beforehand and hope for helpful answers here. Now I am facing the following problem: I have to replace an old, rotten 42-meter-long fence, which, however, stands on a usable concrete foundation. The foundation is not entirely level and has a few small bumps (3-5 cm) along the 42 meters. My plan would be to clean the old foundation with a high-pressure cleaner and lay lawn edging (100x25x5) horizontally as a surface. Since the foundation is 20 cm wide, the "bumps" could also be evened out, as well as the 2-3 centimeters by which it is out of level along the entire length. The key question: what should I use to attach the edging? Flexible adhesive, cement mortar? I have bought a double wire mesh fence (83 cm high) with posts that can be screwed on. After laying the edging, I want to fasten the posts with screws long enough to reach into the old concrete foundation. Can this work like that?

What will happen to the fence afterwards? Grass up to the fence? I would use adjustable feet for the fence and level it with them, then slightly raise the GOK to create a mowing edge with curbstones placed only on decomposed granite/soil. Saves the complicated process planned. KIS = Keep it simple

2cm over 42m is not level... I doubt that you have a measuring device that allows you to place the individual lawn edges more precisely.

What I would worry about the most is the pressure sensitivity of the lawn edges. If they are the classic concrete stones, at least in my experience, they were quite pressure sensitive on the flat side. I would be afraid that they would break/splinter when the fence is loaded.