Boo,
I would use a monitor when the speakers are that far apart, especially if you doing vocals. Unfortnately, I just gave mine to a friend about six weeks ago, and I seriously doubt that he's ever use it. If you're going to use the Rogue for a monitor, make sure you keep the level low and use lots of bass to eliminate the possibility of feedback from your mic. Additionally, I wouldn't place it behind the rig, that's just disaster waiting to happen. Place it in front of you and if at all possible, face it up at a 30 to 45 degree angle. Less chance of feedback, better monitoring ability.
Good Luck,
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)