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Could you save any space if you used small USB extension leads and mounted the RTL above the RPI?
Those little "teeth" hold the USB plug in place. When Apple first came out with the Lightning connector, the holes for the "teeth" on the connector were way too deep, causing USB cables to get stuck in the computer. One of my neighbors had this exact problem: I was able to get the cable free with a knife, and had her order a short USB extension cable so if the cable got stuck again, it would at least be stuck in a $2 cable instead of her $700 laptop.
tried something like this? [link]
$3 bucks man.
I have like 10. They're invaluable, unless you count the 3 bucks.