I'm a Spanish Mining Engineer. I do not live in South America, but many of my Spanish colleagues ended up working there as Spain mining industry is really depressed, so it is somewhat likely that you'll meet Spanish people over there.
Feel free to contact me with the "Send message" button on my profile.
About neutral accents, there is no such thing, and as a late second language learner your English accent will dominate unless you make a really strong effort and spend some 1000's hours on it.
Good luck Emma. You will need to spend 1000-2000 hours to reach a functional level for work (not bilingual and not a tourist).
Old teaching methods focused on grammar and translation. This was not effective for training people to function in the language. Modern methods focus on reading, writing, listening, and speaking. Due to tradition and cost, the listening and speaking are usually minimal at the beginning levels and adequate at the advanced levels.
You should consider an immersion program, particularly after you have a basic foundation. In my opinion, six weeks in a university immersion program is worth more than a year of daily classes. I had a very productive experience in French immersion in Canada and my stepdaughter had a similar experience in an immersion program in Spain.
Congrats on your efforts to learn spanish, awesome language hahah I strongly recommend an app called Lingvist to increase your vocabulary in a fast way and Tandem to practice speaking with natives. About neutral accents I recommend colombian and peruvian.
Buena suerte con tu aprendizaje!
Hi Emma! How are you?