Good morning,
I'm not american, but I have already travelled a few times to USA, because my sister lives there. About the accent I can tell you that even Americans didn't notice it, when I was there. I work in a multinational company, where I need to speak in English with many people around the world, and they say the same, so I believe I dont have any South American accent when speaking English. Also, I'm an English teacher since 2010, and my work is highly recommended because I can build texts which are grammatically correct and very well structured. If you are interested, please send me more details about the project, and we can discuss the price.
Thank you in advance.