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Hi Chops...,
I think there actually may be a place on your car where they may help drag.
The windshield of the Cube is so vertical, that air has to be bleading sideways off the upper corners. The Air is going to have a bunch of momentum, and will be highly compressed. It will also be flowing significantly off the direction of the flow of the air around the car. When it flows off the windshield the momentum and misdirection will cause all sorts of turbulence, and make the aerodynamic size of the vehicle much bigger.
Try placing two of those about 6 inches in from the oustide edge of upper third of the wind shield. Before you place them do a yarn test to find out the wind direction, and make a marker mark from the inside of the windishield along the length of the yarn. Now align the blade of the vortex generators off that line a little bit. Experiment with either side of the line. Have somebody follow along the side of your car and take video, while you mist the windshield washer while travelling into the sun. It should become apparent which direction causes the mist to trail more closely down the side of the vehicle. That is the orientation you want.
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