We just purchased a 750Li in July and absolutely love the car; however, our EZ Pass transponder won't work because of the sensor in the windshield. The lovely PA Turnpike only has one other option -- a "bumper mount" plate. Unfortunately, it is flat and doesn't conform to the front bumber of the 750Li. Has anyone else run into this problem? Is there a known workaround that won't mess up this beautiful car?