I looked these up to see what options people in the Midwest have if they don't dig into the ground. I wouldn't trust this. Would you? I mean, I guess they are better than nothing, but I wonder if they get staked to the ground.
Survive-a-Storm Shelters Twister Pod 4 ft. x 6 ft. Tornado Storm Shelter SASAS04D - The Home Depot
Survive-a-Storm Shelters Twister Pod Tornado Storm Shelter provides secure, safe enclosures for protection against natural disasters and storms.
www.homedepot.com
Survive-a-Storm Shelters ShelterCube Extreme 4 ft. x 6 ft. Tornado Shelter SASAM0406 - The Home Depot
Bring style and value to your garage or work space by selecting this durable Survive a Storm Shelters ShelterCube Extreme Tornado Shelter.
www.homedepot.com