I just started a megabase using the peaceful option. My problem is that the game doesnt feel right without normal biters...
So I wanted to start another game with standard difficulty.
My main problem with biters is that they are very enerving when scaling and planning for megabases. You can't just watch your beautiful (spaghetti) base for a few minutes without biters breaking through somewhere and eating your factory...
So I have a question:
Is there a point (tech wise / defensive wise) where you can wall off an area, place X turrets or lasers and you will never have problems with biters braking through again? In other words: Peaceful mode in a conquered area.

Greetings and thanks,
Skyline