Hi Tony! From my experience with Maggies, they will usually sound best against the longer wall, but the 11 foot depth of the room is just as big a problem, especially with the piano you have. Having them on the short wall is not the best setup either, due to the lack of width with your soundstage. The 3.6 is so wide that the two side by side take up almost half the width of the room! It would be best to try another room, or remove the piano if you plan on enjoying either of these speakers in the proper context.
Good luck!
Good luck!