First of all, expect to have at least two different agents in this process if you really want people who know their area inside out.

Mortgage insurance is an easy thing to conceive of because you have a specified liability, but if one of you pre-deceased the other, you would really have other things like your car etc to consider. You should get enough regular life insurance (it will be less convenient, but usually a lot less expensive) to replace each other's income.

Most foreclosures, however, happen because of an illness or injury lasting more than 90 days, not because of death. You two really need to review your disability coverage as well.

I don't pretend to know anything about Property & Casualty, so look for those answers seperately.