To your question: Premium: Our model has granular rating for high risk areas (fire is the biggest issue there). And part of that is the defensibility of the specific property for sure. But unfortunately the biggest factors there are all location specific - distance to water, slope, ease of access, distance to burnable area, etc, which not much can be done about. This is why although it is hard, communities investing in collective defense has the biggest impact on insurance prices.
On claims: We have reinsurance, so no need to fear us being blown out capital-wise. To actually get the claims paid and work done we (like most others) have contracts with emergency-overflow claims administration teams, so that a force is ready at peak times.