In SOD1, outpost had the option to get fuel mines to expand radius and was good for stopping hordes. Bring it into SOD2 to make the outpost an actual safe spot. In a zombie wasteland, you would build barriers and traps to prevent zombies for getting to the base or at least give warning to the approach of them. I have been to a few of my outpost with 1 to 3 hordes in safe space. I wouldnt give them mines without getting them ( paying resources for them) nor expand the zone as it is big enough.