The QNAP TS-264 fits NVMe into a compact 2-bay chassis

Two SATA bays plus two M.2 2280 NVMe PCIe Gen 3 x2 slots make the TS-264 a versatile little NAS. The NVMe slots work for caching or storage, so you could build a surprisingly fast compact setup. The x2 lane width per slot is a mild limitation, but for a 2-bay unit this is impressive flexibility.