Don’t know about the UK, but in central Europe it’s common for houses to get three phase power that can then be used on 400V three phase circuits and gets split (ideally evenly) into 240V circuits. And the fact that the phases have effectively zero coupling means that you also need to just try the adapter to find out if it’s going to work or not unless you happen to know how exactly your house is wired up, just like with split phase power.

Apartments usually get a single phase though, but IMHO it’s also less likely that WiFi won’t be enough there, so it’s questionable if that’s even a point for powerline.

Hey, just a tiny note: static and dynamic addresses aren’t mutually exclusive. You can let SLAAC do its thing AND also set a static address on your server. Remember, IPv6 works best when you aren’t afraid of adding more addresses.

Maybe htop? It’s pretty configurable and has decent bars for various resources.

Also if your reason for choosing pure TUI is just resource usage (and not the aesthetics of it / cool feeling / whatever else), then you could maybe look into running something like Sway or Xorg+i3 - those are very lightweight, well suited for single window usage, and open up a lot of possibilities for lightweight GUI apps.