The correct preposition to use in these cases is "in addition." This phrase is used to introduce additional information or to indicate that something else is happening along with something already mentioned. For example: In addition to the team, we will need to hire a new employee. Please include your contact details in addition to your resume.

“In addition to” is a preposition, which is not usually preceded by commas because its primary function is to link verbs and nouns within clauses. Therefore, it is common to see “in addition to” in the middle of a sentence, with no comma before it.

In addition (prepositional phrase) and additionally (adverb) are connective words that add information in one clause to the information in the next clause. The word (s) are separated by a comma. Also¹ (a focusing adverb) can be placed before a clause or before other elements in the clause.