Hi
It’s true that a lot of Linux Devices out there, including Nethserver, use NUT, but have hardcoded users / passwords for it.
NethServer, QNAP, Synology are among the many…
My solution is to use a Raspberry PI for NUT. Cheap, easy to replace / use the config at other places.
I have the Raspberry handle all my NUT requirements, and connect Nethserver, Synology, QNAP, Proxmox to the Raspberry as NUT-Server. The Raspberry reports to Zabbix Monitoring (On the Nethserevr).
Another benefit: Using the Raspberry instead of any NAS on site usually gives me more info about the battery. The built in NUT in many NAS are very simple (Do not use all possible options).
My 2 cents
Andy