3 feet from the front wall is enough, and about 30 degrees of toe-in. I had my 2.5s for many years in quite a few different rooms, they are not too picky about placement but they are meant to have a little bass reinforcement with the front wall. Pull them out just enough to get clean bass, then add toe-in to taste. Set the knobs to flat, some might find that too bright so just a little off the tweeter if that sounds good to you.
Thanx, Russ