The way we usually do it is position ourselves so the MT and OT are at a right angle to one another with the melee inside the "pocket" area between the two. The MT takes the first spirit and the OT takes the second then, when the third spawns, the MT taunts it and the OT picks up the third (and fourth on second transition). This stops any one person from having to tank too many Raging Spirits at once if your DPS isn't high enough to burn them down without some overlap.
Our setup looks something like this:
So you never have two Raging Spirits facing the same way at any one time.
OT - RS melee Healers Other Ranged