Wifey saw that too and didn't like the possibility of being just another projectile in the mele. That is why we went with the below ground in the garage. We do have a jack some wood 4X4s screws boards and a come a long inside. I also take a bucket with litter, a battery radio, a gun or two, or three, with ammo and some flashlights with batteries. A deck of cards might be a great addition just in case.I remember flying out not long after the 1999 tornado. It looked like a giant eraser path. Sections of asphalt roads and parking lots just gone.
Each version of shelter has pros/cons obviously and will depend on the person or families particular situation. For me, I don't want it outside because I don't want to deal with hail, lightening and rain getting to it. I just can't trust above ground after seeing the path of the Moore F5 from the air. I'm sure they are fine, but for me, I want to be under ground.
Our last house we had a neighbor ask to join us one evening inside our frady hole. We cordially invited them in and they brought their yellow lab with them which was just fine but he had just been sprayed by a skunk. Since I was turning green, about to blow chunks I gracefully left the safety enclosure and sat in the living room watching Gary pointing out with great fervor my future demise.