For home use (and small uses at work) I've found cyberpower to be cheaper than APC and yet work as well. You'd likely need to get a model with a network card option, and that'll cost more I think. I'm not in EU though, so IDK what model would meet your needs and price point (which seems pretty low to me for a network enabled UPS).
Strangely, that generally is how my Linux boxes have been - way less IT guy than when we had WinXP or Win7. You have to use a stable distro however - which TBH is the problem with Win10 and 11 for a lot of people - finding the "stable" version isn't available to home users or is complicated - so you have new OS deployments every 6 months. Windows Updates are now forced and still often have problems or bugs.
That all said, I think we've just got to get used to unstable / rolling release OSs cause "everyone" is doing it. Even Alma is not as stable as previous enterprise linux rebuilds due to Red Hat not releasing point release security updates anymore.
Crypto is entirely an extremely expensive gambling system. It serves no actual explainable purpose for the vast majority of people. It's trivially provable to be worse than existing alternatives in every way that isn't scams and or money laundering.
All you really have to do with Zerotier is set up your network routing appropriately, and the end server would do reverse NAT, presumably via IPTables in most situations. Zerotier is just a virtual cable, everything else is the same as if you plugged in an ethernet cable between the two endpoints and you can run network services there just the same. Oh, you do have to enable the ZeroTier client to route public IPs for this to work.
For home use (and small uses at work) I've found cyberpower to be cheaper than APC and yet work as well. You'd likely need to get a model with a network card option, and that'll cost more I think. I'm not in EU though, so IDK what model would meet your needs and price point (which seems pretty low to me for a network enabled UPS).