L/R's just outside the screen edges and toe'd in. To me, this provides the ideal front soundstage, with appropriate width, good lock-up of sounds to images, and minimal effect from the screen on the sounds from the L/R's. A good Room Correction program can even out the CC to make it work with the L/R's.If the speakers are toed in, as in the diagram, it seems to me they are not 30 degrees off-axis, they are zero. The enclosure is 30, but the drivers are zero.
All things being equal, it would be nice to put all three behind the screen. The yellow position behind screen would still leave the L-R 9 ft apart. My current media room has Polk bookshelfs 6 ft apart with a similar 12 ft MLP, which seems to work OK although it's mostly 5.1 listening. While 22 might be narrow if toed in, it seems like it should be fine if not toed-in, if a toed-in speaker is really zero off-axis even if the enclose is 30. Maybe I'm missing something here? BTW, do you have a picture of how you toed them in if they're InWalls. I originally planned to put InRooms on a shelf behind the screen so as to toe-in, but was told to stick with InWalls when in the wall. There's 2.5 ft of space behind screen. Thanks for the responses.
L/R's behind the screen is too pinched for the front soundstage. Too wide, and the soundstage is too big, and the sound locations don't lock up to the images.
In-walls are not as easy to toe-in, but in-room speakers on shelfs are just as good and easily aimed.