Item arrived with no instructions - but it was easy to figure out how to assemble. a HAT with your RPI4b. I'm using an official RPI POE+ hat and the device doesn't leave enough clearance (3mm between the fan on the POE+ hat) - so I added an extra M3x12+6 clearance for better airflow. I think the product is good value and the extra spacing is a slight improvement - I would recommend this even if you don't use a HAT. Check out the pictures I've included.
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