I think that could be solved too, by having a option as well to show/hide people teleporting to same plot as you to get into their own instanced housing, so basically making it you can make it you don't even have to see them teleport in.

That way you can keep the peace and quiet of your own house, everybody can have their house, and people who really want to see people tp in and out to get a feel that the wards are active can just turn on the showing of people teleporting in / away from the placard.