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If you look in your .rviz configuration file, you'll notice a Tools section.

 Tools:
    - Class: rviz/Interact
      Hide Inactive Objects: true
    - Class: rviz/MoveCamera
    - Class: rviz/Select
    - Class: rviz/FocusCamera
    - Class: rviz/Measure
    - Class: rviz/SetInitialPose
      Topic: /initialpose
    - Class: rviz/SetGoal
      Topic: /move_base_simple/goal
    - Class: rviz/PublishPoint
      Single click: false
      Topic: /clicked_point

You can most probably, cut/paste the Publish Point multiple times with different Topics. I haven't tried, but give it a shot and see if it works.