One base board for three different form factors - Arduino UNO, Arduino Mega and Raspberry Pi 2/3. I wasn't looking for a recessed base plate, but this design feature didn't bother me. The manufacturer carefully included mounting screws and a screwdriver, but given the overall cost, the quality of these accessories can be forgiven. Minor problems with the mounting screws used to attach the boards - the tolerances were violated. I usually stop by the local "discount" giant hardware store for an acrylic base plate in which I drill holes for mounting plates (I buy screws in bulk in various sizes as they are not easy to find at budget electronics retailers). I'm a strong believer in baseplates for "mastery" exercises. I usually avoid the cases (of course the Raspberry Pi has a wide range, but the Arduino doesn't, unless you have access to a 3D printing service). I fully recommend this product from SunFounder, despite the slight irritation noted in the first paragraph.
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