I haven't heard the F version, but I did audition an earlier 116 (sorry, don't recall which generation) in a room similar in size to yours - with the MBLs against the short wall, out about 4'. There were maybe 2 feet between the outside edge of each 116 and its respective side wall. I thought they sounded very good, but I'm not sure that they wouldn't have sounded better in a larger space. You definitely get a generous taste of the omni juice in such a set-up. OTOH, while bass impact was superb, real deep bass extention struck me as (just) a bit shy for a speaker at this price point.
Good Luck,
Marty
Good Luck,
Marty