Check out the forum's aerodynamic streamlining template, at the top of the page under "Tools". I plugged your car in and came up with this:
While not strictly 100% true, anything below that black line is in the car's "wind shadow" and isn't going to help maintain laminar airflow.
Marked in red is the shape of a kamm that would help lower CD:
EDIT: For comparison, here is how my Insight follows the template:
