My understanding is that there's 3 configurations
Single motor, non-P: 1 large motor in the rear.
Dual motor, non-P: 2 small motors in front/rear with front motor geared for cruising, rear for accel.
Dual motor, Performance: 1 small motor in front geared for cruising, one large motor in the rear.
There's really no reason to have a front motor only. It's done in ICE cars to save cost/complexity since the engine is up front. With how the center of gravity shifts during accel you want the drive wheels to be on the rear since they have better traction.
Same reason in reverse you have large disk brakes on the front wheels and drum in the rear.