My use of the rear hatch area will eventually lead to wear of the OEM covering since it is a felt-like material instead of carpeting. I found a rubber mat that is supposed to be sized to fit on top of the Focus Electric's cargo organizer from Rubbertite. I'll post some photos of it when it arrives. Until then, here is their website.
Also, I found that the Weathertech Digital floor mats for the regular Focus fit perfectly in the Electric for driver and passenger locations. I did not get any for the rear. The driver side mat includes the hold-down rings that the original carpet mats have.