I installed the Firefox flatpak and then just kept opening new windows, making it "Float in world", and then opening another one. I found you can have up to 10 before they start just rendering as black boxes. Still though, 10 virtual monitors running browsers is pretty neat!
(Ignore the choppiness of the video, that was just OBS fucking up, it's perfectly smooth in the headset.)
Uptime Kuma for monitoring web service status (just like if the jellyfin, etc. website is up), and Zabbix for monitoring system metrics like CPU/Memory/Disk I/O, etc. Zabbix can do a whole lot, but can also get a little complicated. There are plenty of guides out there for configuring it though.