Unable to use nix to configure systemd

Sorry for the maybe newb questions, I am new to nix.

I could not get any systemd related seetings to work. Maybe this is the syntax that changed, or maybe I just found old stuff.

  1. I want to suspend on Idle. For that I have currently:
services.logind.extraConfig = ''
  1. I want to suspend/hibernate on low battery. I have tried:
services.udev.extraRules = ''SUBSYSTEM=="power_supply", ATTR{status}=="Discharging", ATTR{capacity}=="[0-5]", RUN+="${pkgs.systemd}/bin/systemctl suspend"'';

and 2.b.

services.upower = {
  enable = true;
  perentageCritical = 5;
  criticalPowerAction = "Hibernate";

All of these have failed. Any advice?

I have tried Arch before, but I actually have never been able to use an udev rule, even copy-pasting things from the wiki. May that be related to my hardware and their firmware? I use an Acer Nitro 5 laptop.

Edit: I do not use a DE, I am on hyprland.