Shakedown starts at 8.00 and normally it gets quiet with WRC crews before midday. Of course there are non-priority drivers for longer period. Even if you'd stay at the shakedown longer, visit service park, eat up, you have time to find a place for SS1.
Your second questions is much more complicated. Best option is to study: old videos, old stories, old maps and see how they meet your preferences. Good places are all over the place. Some places just are better than others.