Yes it's possible to spawn there. Only places that are taken by structures are free from spawning. Only in Single player mode there are specific plates where you can spawn. In multiplayer battle you are not safe by simply setting your walls against the edge of the forrest.
Let me just say I love this game up untill now. I'm hooked. I would just like to point some things out that would (in my opinion) make the game slightly better. Building and Advancing When you get to the Gunpowder age building takes way too long. At least for me it was then. I can imagine for...