I found a very nice place deep inside the fog light door to hang the key from using a twist tie, doubled over and twisted many times that will not come loose or rattle. Makes me smile thinking about it hanging in there swinging back and forth as i drive. There are so many places inside of that access door to hide a key. depends on how creative you want to be and how paranoid you are.

I looked at the space behind the front license plate bracket. My only concern was it rattling and falling out while i am driving. All in all though a very good place to think of in the first place!