Have you thought of opening a Support ticket with those GPU Coolers to see if their products are compatible to fit on the RX480 GPU card?
Also depends on the manufacturer of the RX480 since the dimensions of the cowl might not all be standard size.
Went to Rajintek website and took a look at all their VGA Cooler and none are compatible with RX4xx and RX5xx GPU cards.
But Artic Accelero Extreme IV does indicate it is compatible with the RX4xx and RX5xx GPU Cards: https://www.arctic.de/en/ax4