Great app, and easy to reposition if need be.
To place it centered just above the virtual mirror edit \system\cfg\damage_displayer.ini that way:
POSITION_X=805
DISTANCE_FROM_CENTER_Y=-970
Here's what you get on a 1080p display:
http://www.mediafire.com/view/oq9cyl63dg2r9r6/mirr.jpg