Zone control works for allied NPC’s only.
If I was going to stay around Board up all the doors/windows/block with bookcases except 1 door.
Outside that door/window leave 1 good solid block of ground.
After that dig 2 deep hole on all sides. Add spikes (optional). This way you can fight on it.
How do you get across. 2x4’s. With them on the tile (the open one) or inventory you can drop them to walk across. Just remember to pick them up and put them someplace else.
NPC’s aren’t smart enough to do that.