FYI iMac 21.5" Display adhesive strips need a slight alteration!
Hi Sam,
It looks like the newer 2017 models have moved the front facing microphone from the top of the display to the bottom off to the right side. A small cutout for the microphone will be needed.
Warren Wilson posting here: Muffled Microphone - iMac 21.5" (mid 2017) - Following Adhesive Strips Has a good image of the new placement.
Can you also make the correction in the guides as needed?
Is this a good question?