I have found one more A-B-A test (AirTabs on Honda Fit):
http://s89686473.onlinehome.us/airtabs-test.html
Personally, I am thinking of installing them on my Dacia Logan MCV (long station with vertical back end).
(image taken from
Renault Car Rentals Renault Auto Rental)
I wonder if they will help as the rear back is somehow "tikered" - there are curvatures with sharp endings etc.