QNAP TS-h973AX

[ed]

You could consider Qnap 74 series NAS. This come with ZFS and NVMe slots. You can install an entire OS on these SSD to improve the speed. Or simply go for the cache option.
https://www.qnap.com/en-us/product/tvs-h...s/hardware
Otherwise, consider building your own NAS using TrueNAS OS.

I hope this helps.