They're angled. I have a better pic of them, which I'll upload in a little bit. The middle 4 are at 15 degrees, the next pair at 10, next at 5, and ends at 0. I'm going to reduce the angles of all but the middle 2 and move them back half an inch or so and see what that does, if I can get more of the adhesive pads they came with. I'm not too keen on ordering a whole second set just for that...
I have done tuft testing, and it's quite easy to see when the back glass is wet, too. It even forces water droplets into the swirl shape. Don't have any pics of that, though.
On the trunk, the tufts all spread outward from the center up against the glass (just in front of the middle brake light), spreading in the direction of rays in kid's sun drawings. You can tell it completely killed the area of low pressure behind the back glass, but it's adding to drag from the large counter-rotating vorticies. In other words, I'm sure I have extremely effective lift reduction, but almost no drag reduction. Mileage doesn't seem helped or harmed with them.
Here's one of the pics:
