Hidden Readers

I am designing an access control system, and the interior architect has a requirement that I have not come across before: for aesthetical reasons the architect wants readers (contactless, iClass) which are "hidden" in the wall next to the door. The readers shall be ducked in the wall and be flush-covered with some aesthetical appealing material which does not disturb or obstruct the signal between card and reader. Does anyone have experience with such solution? What are the caveats, and what materials qualify for covering the reader?

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