To be fair to Frodoz737, you pulled out quotes from me, not him.
I'm just trying to be helpful here to my brethren with fluid dynamic expertise from a bona fide rocket scientist (my father).
So, I will give one last bit of discussion (as it is still 2016
Yes, it doesn't matter whether the radiator tilts back or forward, as long as the air has a flow going that direction. In my case, the radiator lays backwards, the air comes in from the front through the top, and the entire bottom of the trunk is cut out for the air to flow out underneath. Everything is blocked off so that the flowing air can't sneak out the sides of the radiator or through the trunk lid. It simply has nowhere to go but through the radiator for maximum cooling.
You said yours is going to go lay forward and the air will go up and out the vents in the hood. All things being equal, I'd agree that shouldn't matter.
What I don't know is if there is equivalent suction between the two set ups. In the back tilted radiator, with air flowing under the car pulling the air through the radiator versus the forward titled radiator with the air flowing over the car pulling the air out the holes, or if the small holes in the trunk are enough to provide sufficient volume of air flow. I can postulate all sorts of theories as to why one might be better than the other. But, without windtunnel testing, these would be merely guesses on my part.
The one thing I don't know about your forward facing radiator is if the floor of the trunk is cut open, or just the front part of the trunk in front of the radiator. If the floor is not cut out, then I'd think the air should flow up and through the radiator. Again, just trying to help here. If the bottom of the trunk is cut open, I would be concerned that the air flowing under the car and under the radiator may have the tendency to pull the air under the car before it can get through the radiator, and rob the radiator of air flow.
As they say, as long as the car runs cool enough, doesn't matter. But I suspect that in some set ups, the fan may be doing more work than it needs to. My fan comes on only in hot weather stop-and-go traffic.