Thank you for the tip regarding S_Onro. However, I would like more "variability" regarding a free view outside. Visually, I actually find them quite appealing. But I will stick with venetian blinds.
Basically: I would like to have the same solution everywhere for the sake of aesthetics (so for example if Z, then on the ground floor and upper floor).
On the ground floor: I don’t see a problem with Z-slats (regarding the 90-degree issue), since we have a pretty large overhang + room-height windows anyway. So there is actually no need here to set the slats, for example, to 135 degrees (either fully open or e.g. at 45 degrees => then privacy is provided).
On the upper floor: Here I find it annoying if I, for example, dance naked in the bathroom during the day (which sometimes happens with good music => if the slats are set to 45 degrees here, anyone passing by below can see inside).
Basically 2: The main reason for Z for us would be the wind issue (more darkness doesn’t really matter to us). Are there not, for example, C-slats that have been optimized for wind?
Somehow tricky.