Where do you put the transponder? The two recommended locations on the windshield do not apply, since a large area behind the rear-view mirror is occupied by that black panel. It could go to either side of the panel, or lower down on the windshield, which would extend the obstructed area of the windshield. We are in an EZ-Pass state that just went toll-booth free, which means if the reader can't see my transponder, I'll get charged extra.