My 2 cents
rather than have the underside of the cable rest against the road surface, could you have an all-in-one clamshell design with an integral hinge (polypropylene for durability?). So you fold the thing around the cable and then wedge it under the wheel / drive over it.
I suppose if it includes snap fits to lock it together, you could just leave it on the cable. It's not like the distance between the charge port and the wheel is gonna change (unless Tesla have the foresight to allow the same cable to be used on the Model S
ETA: you may want to look at branding for different EV manufacturers. Tesla and Nissan are the most obvious, but this has the potential to appeal to all plug-in varieties. No pressure