Winds can carry burning debris hundreds of feet through the air, so it'd need to be more like a village in the middle of a lake. Though it wouldn't have to be a

Winds can carry burning debris hundreds of feet through the air, so it'd need to be more like a village in the middle of a lake. Though it wouldn't have to be a lake, just a barren field that has no (or limited) combustables. But would still need to be quite large for protection, and buildings would still need to be fire resistant to protect against burning embers.