But realistically, the 2x PSU case was a common crypto mining setup and yeah, you have your electrician install two circuits right next to each other. Or use a 240V PSU.
That's exactly what I imagine would need to happen, I'm just surprised that the specs are claiming all of that with a single 1600W PSU. It's the kind of thing that doesn't inspire a lot of confidence that someone has thought through the details of what they are claiming to sell as part of this pre-order.
Nitpick - almost all modern power supplies are auto-ranging between 100-240V. In 240V locales at 80% constant load on a 15amp circuit this is 2880 watts. In the US you would (ideally) drop a 240V circuit from the panel and make sure you have sufficient supply amperage from the utility provider.