Furthermore, do obd2 scanners work on all cars? The OBD2 scanner is the standard software that has been mandated by PA for use for all vehicles with an on board diagnostic software.

Eric the Car Guys says to put them on the bottom side of pad.Maybe it doesn't matter. put them that when going forward the wear indicator is before the pad. so if the caliper is on the front side that's up, if the caliper is on the rear side that's down.