My dad got a exterior tag for this car, but the screws for the front are too small, to fit the tag. Can I just put the exterior tag on top of the dashboard inside the car?
Probably not. The reason that they send exterior tags is because certain cars have materials in the windshield that prevent the tags from working through them. If EZpass sent the outside tag, it is most likely that your car will only work with that tag. My parents Saab had that windshield, and we were given the exterior tag, while the BMW was given the interior tag.
That car that requires the exterior tag is a diff't car. We only have one tag, so we want to take that tag, and use it in a diff't car, which doesn't have the special coating on the windshield.