What kind of substructure is that? No edge restraint, is that possible? How thick are the slabs?
Substructure consists of frost protection gravel compacted with a slope. Then drainage concrete at least 8cm thick and the slab is glued with flexible adhesive. Porcelain stoneware is 2cm thick.
I deliberately left out the edge restraint. Now a construction protection mat will be placed vertically in front of it or a fleece, and then I smooth the soil nicely against it so that the lawn is a bit higher, allowing me to mow directly over it with the lawn mower.