The position of the station is not optimal. In terms of width, it barely fits if you place it in the middle. However, it is always in the door’s path. Either you place it on the existing slabs and pull 4-5 small empty conduits underneath (1 x BK left, 1x SK 1, 1 x power from the transformer, 1 x SK 2, 1 x BK right), or you put it on the lawn, which means there will always be grass around the station that you have to cut, or you lay additional slabs on which you then place the station. The advantage if it is in the corner is that you can easily manage with one search cable.
Due to the level terrace and edge boundaries, you have excellent conditions for a robotic mower. You can lay the boundary cables directly on the edges. This way, the robot drives a little over it, and no strip remains.
If the money is there, I would always choose Husqvarna. The service is lifetime. Gardena is not worse. Sometimes they are one generation behind Husqvarna. But Gardena is Husqvarna. You can even use the blades from your father-in-law :p In the forum you mentioned, there are also some freaks who sometimes have pure Poa supina lawns where the robot can no longer get through, etc.
With a robotic mower, you will never achieve the result of a cylinder mower. A robotic mower does many things quite well. But if you want a really great lawn, you still have to fertilize and water regularly...
Before the robotic mower starts, you should definitely mow manually. The robotic mower should only cut the tips and preferably do so daily. In weekly intervals, you can then reduce the cutting height until the desired height is reached. The blades should also be replaced regularly. The interval depends on many factors (lawn, area, etc.). But you can hear it from the noise and at the latest when the grass tips fray and turn yellow... For example, if you take the recommended Gardena, it is probably enough to replace the blades 2-3 times per season. Gardena does not have a worse mowing result. It is more likely owner errors.