One particular advantage of adding endorsements rather than seeking coverage through a separate insurer is that you have all of your coverages in one place. Furthermore, if you have, say, home and flood insurance with the same company and you need to file a home and flood claim, some insurers may only require a single deductible for coverage to kick in. Some endorsements that are indicative of a good homeowners insurance company are:

NerdWallet averaged rates for 40-year-old men and women for 20 ZIP codes in each state and Washington, D.C., from the largest insurers, up to 12 in each state. “Good drivers” had no moving violations on record and credit in the “good” tier as reported to each insurer. For the other two driver profiles, we changed the credit tier to “poor” or added one at-fault accident, keeping everything else the same. Sample drivers had the following coverage limits:
Progressive has a slew of available discounts — sharing the top spot for most discounts with Farmers. There’s even one for adding a newly-licensed teen driver to your existing auto policy (surprising given that teenage drivers are among the riskiest to insure). But a policy loaded with discounts isn’t necessarily cheaper than a non-discounted policy, and the Texas Department of Insurance’s data on premiums show that Progressive is, on average, the most expensive for young drivers among the top five in Texas.

The reason car insurance is so cheap in Wisconsin is a bit of a mystery. While not a huge magnet for severe weather it does receive its fair share of snow in the winter and tornadoes in the summer. Flooding is not uncommon and rising rivers point to spring flooding this year. Flood damage is covered by comprehensive coverage, which is not required in most states, if you want your vehicle to be fully covered, you will need to carry this optional coverage.
Collision coverage has a deductible, which is the amount you pay before your coverage helps pay for your claim. You can typically choose the amount of your deductible when you buy coverage. So, if you choose a $1,000 deductible and your car is later damaged in a covered accident, you'd have to pay $1,000 toward repair costs. Your collision coverage would help pay the rest, up to your coverage limit.