AFAIK up to 4 cards are possible. If you do not start the robot from the dock but manually move it to another place, it has to orientate itself briefly at the beginning, but then it knows where it is and cleans according to the room settings.

yes, it works. We have 3 floors and a card for each. At the end, however, it always looks for the docking station for a certain time - it then goes through all the rooms on our floor before giving up and saying "I can't find a docking station, go back to the starting point". It's a bit strange, but not too annoying.
Unfortunately, it doesn't do anything except go up and down the stairs ;-)

In the app you can choose the shape of the building: Single-storey or multi-storey.