I'm dubious about word order in a situation of adverb plus phrasal verb. My specific question is the following. I want to refer to an article that deals with a certain topic. That topic is not the only one covered in the article but it is the most important one.
Which of these sentences is correct?
Your article deals mainly with [TOPIC].
Your article mainly deals with [TOPIC].
Your article deals with, mainly, [TOPIC].
Your article deals with [TOPIC], mainly.
Mainly, your article deals with [TOPIC].
As a non-native speaker, all this sentences (except the second) sound more or less fine to me. Nevertheless, I'm not completely sure about their correctness. Feel free to add some more options. And please, comment about the placing of commas as I may be fooled by my mother tongue intuition(Spanish).