Mid drive motor conversion kits like Pendix, Binova, BestBikeebike use motors with a huge diameter.
I have measured the size of a 56T chainring.
According to their marketing language these motors will fit almost every bike.
These motors always have the driving chain in a narrow space between the frame and the motor.
On a tandem the synchronizing chain must also have its place in this narrow space
I would like to make these motors visible in BikeCad
I have tried with a very thick chain ring.
But did not find the result satisfying.