Thank you for all your responses.
I know what these motors are designed for, I am building it on my own (actually, the 2 rear motors already works and installed at my car).
The problem is that at the front I have a very limited installation height at that's where the Allen shaft has an advantage.
Here is a short video of how they work:
Indeed they have 15/32 steps configurations- from 0 to 16/32 it has to complete 2 full revolutions.
I will read about 3 phase steppers and how to control it from an Arduino.
Hop you are right.