This is a possible spot on the Coupe ... I'm an engineer with an extensive background using CAD and doing graphics, so I too walked around the car eyeballin' different spots to put my XFi decal. The curve of the logo is really close to the curve of the black surround at the rear window, passenger side. I messed up a bit placing it and am afraid to move it. I wanted the bottom more level.

Perhaps the smaller decal that REDCROSS has would look better.

Here's a snapshot ...