No one. The isolators will provide the option of keeping "separate networks" in your home where content can't be shared. Could be useful for parents/kids, roommates, elderly parents living there, etc.
Here is the diagram I linked to on page 1 of this thread from Scott's installation post.
Isolator diagram.
Here is the diagram I linked to on page 1 of this thread from Scott's installation post.
Isolator diagram.