Hi, They'll work in virtually a shoe box!
I owned a pair of AIIIi's for 18 years, set up in a room 26 x 15. Ideally, they need to be set up at least 18" from the back wall and about 7' apart (inside edge). I would say your room is large enough. Place them as above on the shorter wall, toed in to be equidistance from your main listening position in the center of the room. I highly recommend acoustic treatment on the back wall.
Put them on the long way 3 feet from back wall and 2 1/2 feet from side walls, toe in exactly 3 1/2" each. Deaden the walls directly behind the speakers centered twice the L X W of the speakers. Tube traps in front corners. Have sitting area centered exactly 9 feet from the speakers. If using a sub put on right or left side firing across soundstage with sub pulled out 1 foot from wall but 6" in front of leading edge of speaker. If tile or wooden floors put heavy throw rugs on floor. Usually I charge $100 an hour for my services. They are free today/ If you follow this you will be rewarded with excellent sound