Mount IR-receiver?

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Joined 2017
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Good afternoon!

So I got one of these IR-receiver (something like this, but I'm not sure of the exact part). Connected the whole thing and it's working. 🙂

Now comes my challenge: How do I integrate it into my 10mm Al frontplate (black anodized)?

I'd prefer to have it barely visible. (well, a 4mm hole is totally ok, in fact, already done)
Can I:
Use one of those plexiglass-tubes? (Would be nice, allowing me to mount the receiver onto a breakout-board and channel the tube onto the receiver)
Place the receiver on the faceplate's back and have the infrared funnel through a 4mm (9mm deep) hole? (this would probably diminish the wave angle to a narrow window?)

a big hole would be a very last resort.

Side note: Could a much smaller entry-point (2mm) have worked?

Thank you very much, and have a good afternoon!