For setting up a machine gun nest in a building I was taught to put it in a hallway, firing through an internal door across the room and out the front of the building. That way you can use the internal walls as cover (this was described for older buildings with brick internal walls) and as support for sandbags etc.
You lose in field of fire, but win by having a site almost immune to grenade attack, and with a prepared escape route at the back.
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