The Lilium plane has 12 sets of 3 electric motors. Each pair of sets is powered by its own battery pack, and each set is individually actuateable. So it basica

The Lilium plane has 12 sets of 3 electric motors. Each pair of sets is powered by its own battery pack, and each set is individually actuateable. So it basically has 12 control surfaces. Separate aerodynamic controls aren't needed. Writing control software that can handle arbitrary failures isn't easy, but there is plenty of redundancy with the three separate flight computers.