If it's working for you, great. For me, having the health bars at the bottom of the screen is too far from where my eyes are focusing and too far for the mouse to travel. So I put them in a vertical setup just to the right of center screen (much like MiRai does in his videos). This allows me to watch the target, what it's casting (for stuns) and the health bars all at the same time. Also, for boss mobs I try to position the tank so I can see the rest of the team near the center of the screen as well so I can move them when they're standing in fire/poison/etc. Finally, I just leave the mouse inside that VFX "window" during the fight, switching to whichever member needs healing. The only time I move outside the window is if I need to move or turn the tank and for ground target AOEs.

I set one number (3) to trigger a click broadcast (this is a way to do ground target AOE's within ISBoxer). Driving from the tank when I push 3, I then look over at the mage screens to properly position my AOE.... but if the final target happens to end up in the VFX field, on the original screen, it fails! My only work around for this, at this point, is to make sure that doesn't happen (or just avoid ground target AOEs). This would be an advantage to putting them at the bottom of the screen....