Front wheel drive. Change the front wheel for an electric one, it’s the same as fitting a normal wheel, takes less than 30 seconds.

The controller box is hung in a bag, anywhere on the frame.

The batteries come in multiple fitting types; frame, seatpost, luggage rack

The rest is cable ties

I’ve done one in less than an hour, but to do it tidily takes about 4

Source - Me. Been doing it since the pandemic when it really took off