I don't know these insurance companies but I did insure our 4 bikes with our home insurance. It is a premium beside the home insurance. They did require that we send them a copy of the invoice, pictures of bike and serial numbers.

You have to check as every company covers the bike differently (stolen, falls, etc).

For us, I believe we are paying nearly $200 per year for the 4 bikes. Our basic home insurance covers $3000 for bikes. Since our 4 bikes are much more than this it was the logical choice. And the deductible is $100 if we make a claim.