Congratulations on your new Luba 2 AWD robotic mower! Since the Luba 2 is GPS-guided, in my opinion the charging station does not need a line of sight to the satellite. The mower itself along with the RTK station receives GPS signals (unless you are using iNavi) to navigate your lawn.
Placing the charging station on your verandah should be perfectly fine, especially since the verandah is level with the grass and has a solid concrete surface. Just ensure the mower can easily access the station without obstacles.
If you want to be sure about the best location for your charging station or have any other questions, I recommend contacting Luba support directly for the most accurate advice.