In most cases you want this https://www.amazon.com/StarTech-com-Computer-Network-Equipment-PXT515C19146/dp/B00VRET4F0/ref=sr_1_13?crid=JMT7EF9EEZLV&keywords=c19+power+cord+12awg&qid=1654060920&sprefix=c19+power+cord+12awg%2Caps%2C63&sr=8-13
But only use that if you are know the system will not be drawing more than 12 amps.
If you will be drawing more than 12 amps you need the 20 amp sideways prong version, or a 220v cable and outlet.
20amp 110v circuit is often like this in the USA check what outlet and breaker you have yourself:
Both of these are 110V cables, the latter can fully power that PSU on a 20amp circuit... typical for use in the USA, there are also 220V versions for US use but they are much less common and often you'll need to match it to your exact wall receptical.