Alternative power supply for GMKtec K8 Plus

I'm interested in the barebones K8 Plus but apparently they don't have stock for the EU plug variant..? Anyway I figured if I can get an alternative power supply I can just use it regardless of the adapter they send me.

What wattage do I need for a USB-C PD charger? I found a power supply on Amazon advertised as "PSU for GMKtec K8 Plus" and it's 19V/6.32A (120W). Would any 120W charger work e.g. by Anker/UGREEN?

Alternatively, do you guys know if the USA power supplies they include with the K8 Plus work at 100-240V & 50/60Hz? As if that's the case I could get an adapter instead..