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The Samsung drive, as with all enterprise products, comes in plain packaging with zero accessories or documentation.
Any mounting bay/solution that fits a common 2.5” SATA drive will also work with a U.2 drive.
The adapter cable you linked to has the correct connectors on the ends, but no mention of which PCIe generation it is rated to support (you need Gen4).
That OWC thing is an expensive nonsense imo; no matter how many drives you stick in it, bandwidth will be crippled to that of a single U.2 connector (4x PCIe lanes).
ectoplasmosis-
but it's metal and has a fucking LOCK on it ffs
it MUST be good value
EDIT: presumably this is more apt then as it comes with mounting hardware and is gen4:
https://www.amazon.co.uk/StarTech-com-M-2-U-2-Adapter-SFF-8639/dp/B073W65QX6/
CYOA
Fairly sure it's m.2 only: https://www.gigabyte.com/Motherboard/B550-VISION-D-rev-10/sp#sp
So I presume something like this: https://www.amazon.co.uk/DiLinKer-SFF-8639-Cable-PCIe-Adapter-U-2-Converter/dp/B07VB6L8SJ and then figure out how to mount the U.2 after the fact. Presume it'll come with some kind of solution but if not I'll figure it.
Having trouble finding that PM9A3 in stock (maybe one place - 'senetic'?) but it's led me to these:
https://www.megamac.com/products/32tb-owc-u2-shuttle-drive-for-3-5-nvme-u-2-ssd-owcu2shuttle32 which I now covet...