Well.... this was funny. Those mortar are a serious thread. I win because they reaction fire me, and kill themselves in the way. I just tried to be stealth enough to be near then (I was trying to ax some guys in power armors). Nut quickly all became hell. Lots of reaction fire, lots of death people... At least the loot is good, maybe you can research some..
BTW, you can take down power armor guys with the laser, if you hit them by behind and have luck.
About enemies... interrogated everything, pretty soon something will open.