The withholding TAX is always the same for everyone max 30%(which means you will have max withhold), unless you can prove you are not from US, and your country have tax treaty signed.
You need ITIN number, to do not have tax withholding.
The good thing is that getting ITIN is now much easier. You just need signed copy of your country personal ID instead of passport signed by your local US embassy.
Once you obtained ITIN you won’t be subject of US tax withholding, but you still will have to pay your local taxes.