I know essentially nothing about the k40 units, but my first thought was that they wouldn't be as sensitive, if they are mounted in the license plate frames. From everything I've read, the higher the better when it comes to reception of signals.
Plus...I'd have to get a front tag!
Thanks, Randall, on the "concealment issue"...as typically happens, I figured that out more or less immediately after hitting the "Submit Reply" button. (Too lazy to delete!)
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