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Yea, you definitely dont want them at an angle as they will produce [more] lift.
As for the front flaps, the best I have seen are on some newer bmws and audis, they actually wrap around the inside of the tire to promote the air down the center of body.
A key thing to remember is these flaps add drag to reduce drag. So you want to keep them fairly small (the numbers listed above are right on as far as what I have seen).
However, even I wonder if the rear tire flaps could be larger than what we typically see. Surely the rears are subject to lower pressures. The OEMs just dont want something to gaudy that might get ripped off.
Also keep them mounted as close to the tire as possible (preferably inline with the start of the wheel well). Some manufactures (like honda, actually, i think, only honda) have very poor designs, sticking the flap apparently anywhere under the front bumper.
Ive also wondered about a pressure relief system. Perhaps one could increase the size of the flap, to make it more effective, if it had slots built in to relieve the pressure buildup and decrease the size of its wake.
I think something like this can be seen on the new mazda 3's, however there is speculation as to the actual reasoning behind the slots.
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