Makes sense. I wouldn't do this to fix an existing element, only to add to seats that don't already have them. Wouldn't want a short between the OEM element and the aftermarket pad.
The pads are about as thick as corduroy and have tape on the edges for sticking to the foam. The set I ordered are narrow enough that they don't touch the left or right edges of the main fabric panel. Close, but not quite. There was no need to undo the wire clips holding the fabric to the foam core. No modifications to the foam, existing seat electronics, or seat structure were done. Simply slid the pad between fabric and foam. And the seats don't need to be taken apart to do that. I only needed to undo a few plastic clips holding on the fabric.