So, what I would like to do is place a mouse hole on one of these walls so I can access the "non-accessible" part of the keep courtyard. I've tried multiple times placing the add-on without any success placing it near the wall.
Any advice or suggestions?
Screen shot below to show you where I am trying to place the add-on.
Thanks in advance.

Any advice or suggestions?
Screen shot below to show you where I am trying to place the add-on.
Thanks in advance.
