Regarding occlusion issues - Vive lighthouses can be connected together with a cable, so they don't need to see each other (and as for seeing the headset and controllers - I don't think ceiling fans would be an issue here, as user would be significantly lower).

Repeating setup if moving, and the sensors getting moved - from my experience it depends how much space you have available and how fully you have to utilize this space for VR. If available space is large enough, then I notice that it doesn't matter much if the boundaries get moved slightly, if I keep enough buffer between virtual boundaries and physical objects.