The BBS02 normally sits parallel to the ground on most bikes, as the lower downtubes usually swoop upward with sufficient angle to allow that. I have one on a regular mountain bike,
If this Schwinn Loop is like your folder, the horizontal downtube would force it to hang perpendicular to the ground. It will also probably keep you from fully lowering the seat for transport as the seat probably hits the motor.
The lower part of the motor will extend 6 inches from the centerline of the bottom bracket. On my folders that would leave it 5" above the ground. I don't know if that could hit anything.
Lunacycle puts their BBS02 on a Mossa folder. It hits 25 mph easily. Don't know if the Loop is going to feel good going that fast.