I have floorstanders in room similar in size to your room. My room is only 16x12x8 feet. My floorstanders are Eosone RSF-600 dipoles (not exactly audiophile grade, but they work for now). I have them along the 16foot wall, about 23 inches out firing into the short length (12ft). I sit about 2 feet from the rear wall, and about 8 feet (perpenticular) from the plane of the speakers. I forget how far part the speakers are, but I think it is 6-7 feet part. With the dipoles, the soundstage is best without toe-in.
I get a much better soundstage with the speakers along the long wall firing into the short length, than I do with them along the short wall firing down into the longer length. also side wall reflections are less of an issue now. Even if I had a bigger room, I'd probably still use the long wall to place the speakers on. I say try it.
I get a much better soundstage with the speakers along the long wall firing into the short length, than I do with them along the short wall firing down into the longer length. also side wall reflections are less of an issue now. Even if I had a bigger room, I'd probably still use the long wall to place the speakers on. I say try it.