here is where you can get one https://www.etsy.com/listing/1377485134/macintosh-9-inch-crt-to-lcd-bracket? You can also go there to see where you can get a file to print your own but it is for non-commercial use.
I have never heard them called that, but that doesn't mean it isn't a thing... Anyways it is changed to that only because all in one is a much longer thing to say... So now you can be happy that they are exactly what your head cannon and others head cannon isJust as an FYI, those macs are considered "compacts"