

RAID 5 is fine, as part of a storage and data management plan. I run it on an older NAS, though It can do RAID 6.
No RAID is reliable in the sense of “it’ll never fail” - fault tolerance has been added to it over the years but it’S still a storage pool from multiple drives.
ZFS adds to it’s fault resistance, but you still better have proper backups/redundancy.
I’d at least flip the drive on the right so it’s underside is closer to the fan, as that side gets hotter in my experience, so it would have more effective cooling.