We also have a two-row mowing edge made of 9/11 split granite cubes. Works wonderfully. The wear on the wheels is probably higher, but by the time they need to be replaced, many hectares of lawn have been mowed...;)
I searched for robotic mowers for fun last week in my village, 2.5 million inhabitants. Nothing, absolutely nothing, not even Husqvarna, which already sells other products here. I live on an island far away from world affairs ....
Agricultural machinery trade sometimes also has mower robots. However, they can be easily bought online. Installing is not a problem if planned correctly.