adsPower plus a static ISP proxy is pretty much all you need, just match your profile timezone and language to the IP. I would register the account on that same proxy and browse some random US videos for a couple days so it looks like normal user history, don't touch rotating proxies for this because jumping cities will just trigger phone verifications and lockouts. Keep in mind the IP only gives you a clean US footprint, so getting recommended to American viewers still depends mostly on English audio and early retention