If your room is as you say it is, then you need a TOTAL of 90* coverage, so a single 90* box or a pair of 45* boxes. But that is not the whole story or answer. You may need (or not need-it depends) some sidefills for the extreme Left and right coverage, I don't know as we have no other information about your room.
Things like ceiling height, seating and stage placement in relation to the possible loudspeaker placement make a difference in your correct choice/placements of loudspeakers.
As Tom has suggested, you really need to get someone in who knows what they are doing to look at your room and make REAL suggestions, not just guesses, or you will be looking at redoing your system again in the near future.
We are doing a job next week in which the church has been in their room for a little over 2 months and spent way to much on their system and we are replacing the loudspeaker system because the current one is just totally wrong for the room. BTW the loudspeaker system we are replacing the current one with is about half the cost of what they have now FWIW.
It is a lot less expensive to have it done right, rather than just guessing on what might be "right".