ACE questions

[Ghoran Skarr]

How many ACEs can an engeneer plant?
What if im near a terminal where i can get more can i just keep getting them and planting them?
If i can do so , what is to stop me from planting a network of spitfire turrets and mines in the hundreds around a base?

[FearTheAtlas]

I think you only only plant like 5 on a continent? Thats what I read anyway...or maybe that was mines? Annnnyway, its 5 I believe.