I've been running one of these quad nvme mini-NAS for a while. They're a good compromise if you can live with no ECC. With some DIY shenanigans they can even run fanless
If you're running on consumer nvmes then mirrored is probably a better idea than raidz though. Write amplification can easily shred consumer drives.
I’m a TrueNAS/FreeNAS user, currently running an ECC system. The traditional wisdom is that ECC is a must-have for ZFS. What do you think? Is this outdated?