To watch US Netflix, provided you have a US Netflix subscription, just pick any US IP address from among the huge list provided by HMA. All you're trying to do is convince US Netflix that you're watching from the US, so it doesn't matter which you pick, as long as it's in the US.
I've set up two or three IPs for each country I stream stuff from. The reason for that: Say traffic gets clogged on one IP for whatever reason. I just switch to another. It's easier to set up several at once, because you don't have to re-figure out how to do it weeks or months later. Then if need arises, all you do is quickly toggle from one choice to another.