The map is big and hard to tell where paths would be with just looking at the doors, but I guess it doesn't matter because the hero just started right with the goblins anyways. I put them all in a corner and just put traps on the 2 doors, but he appeared right in the room and slaughtered everyone lol. (Then wandered around and died and I won after losing.)
2nd try I just didn't bother moving them and put 3-4 traps on each starting room door and he killed one but then won.