I have a well hidden base on my server. Is there a device in direwolf I can build to block the mini map when I let people visit my base with the use of portals or linking books.
What you're really trying to do is control access to the base.
If your server allows it then take the time to learn MFFS. You can kill trespassers, strip them of their equipment, or just keep them out with an invincible shield wall.