You need to get the vector from your enemy to your character and the extend it behind your character to find the point to move to.
So, from your AI, use FindLookAtRotation, this gives you a 1 vector pointing in the right direction. Then take the world location of both actors and connect them with a ‘Distance’ node to get the distance between the actors.
Now you know the direction and distance, you can add 10% or the distance and add that to the vector between them to find the final target point 