Yep. The front appears to be facing the rear of the car. Don't take too much offense. We can be pretty harsh at times. My first posts here were about my drop in 8" kicker sub and box. I got a lot of flak for it, but its still in the car and I still love it.
It's all about what you like...but yeah, its backwards(kinda hard to see in the pics, though). The curved edge should face forward and the thin bit should be at the rear like an airfoil of an airplanes wing.
The angle is due to the struts which look like they were designed for a more horizontal deck and not the steeper slope of the Boxsters lid. I don't know if you can adjust them...may have to modify them or find some that will work with the spoiler and deck.
Edit: disregard...I see that you say that you got it adjusted.