I find no problem with opposing braces being in the same plane. It is the third one which usually is in a different location, typically due to the level of the receiving member. As an example a top plate and the tie beam, dropped, at, or above the eve line. The two braces joining the plate are in the same plane while the tie brace is moved from this plane allowing the same length brace. If pegged, I like to see braces with conflicting peg holes arranged so the do not conflict.
It these three or four braces are located in the internal parts of the frame you may want to ask your self if the 3rd brace is necessary, it may be redundant.
My general rule of thumb is to make all the braces the same length and other joinery decisions will stagger the bracing, reducing conflicts. There is always exceptions.
Tim
