Reddit reviews QNAP QM2-2P-244A Dual M.2 22110/2280 Pcie SSD Expansion Card (PCIe Gen2 X4), Low-Profile Bracket Pre-Loaded, Low-Profile Flat and Full-Height are Bundled
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Connector: 2 x M.2 22110 or 2280 PCIe (Gen 2 x4) NVMe SSD SlotsPCIe and lanes: PCIe Gen2 x4Bracket: low-profile pre-loaded, low-profile flat and Full-height are bundled. * M.2 SSDs are not included as standard
Just to give you a heads up that you can get a card with just 2 m.2 ports and no 10gb ethernet. They are about half price or more then the one with 10gb.
SATA M.2- https://www.amazon.co.uk/QNAP-Dual-SATA-Erweiterung-PCIe/dp/B07CT8WHJL/ref=sr_1_1?keywords=QM2-2S-220A&qid=1554135131&s=gateway&sr=8-1
NVME M.2- https://www.amazon.co.uk/QNAP-Dual-PCIe-expansion-card/dp/B07CTD5ML5/ref=sr_1_fkmrnull_1?keywords=QNAP+QM2-2P-244A&qid=1554135071&s=gateway&sr=8-1-fkmrnull
I would suggest to save some money though and get the sata card. Drives are cheaper and the pci-e bus on the nas is only x2 so you wont get anything above 800MBps.
But yeah it would be nice to see if anything would work that isn't on the official compatibility list.
Edit: Changed the links to UK since op is obviously from their.