Can I install the database on a NAS (Synology, QNAP)?

Yes, many studios do.
The catch: the MySQL/MariaDB package on older NAS models is often outdated.
If the NAS database version is older than Project Manager requires (Preferences → Database tab),
it won’t work — update the NAS OS or install a newer database package via your device’s package centre.

Applicable to Project Manager running on a shared MySQL/MariaDB database (multi-user/team setup)