more about this: agree on driveshaft inclination doesn´t have to be completely horizontal. think about a car being lowered, this affects as well. (drifting cars, etc.) Another thing to have in mind is the suspension travel (bump or compression travel). Most sports cars have shorter suspension travel, which reduces the angle that the driveshaft is going to have, as the bump travel is shorter. An alfa 166/164 has a way much longer suspension travel because it´s a saloon and weighs much more. It´s all a matter of design/assembling all the parts together and checking that the driveshafts are going to be in a "sweet spot" most of the time, according to your suspension travel which also depends on the spring rates you have. At the end of the day you don´t want the CV joints to be working in a forced position and avoid them to reach the limit.
hope this helps.
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