The cover you reference should work fine if you have the time to put it on. The email feature could be a big help if they monitor weather conditions where you live. Here is what an auto insurer says about hail protection.
A couple weeks ago the area had baseball sized hail. This breaks windows and a blanket is going to be pretty ineffective for that. Best is a garage or car port.
I saw something on some show about people inventing things and these guys tested them out and trier to find investors.
They had one the went over the car and hooked under the body somewhere. It only took a couple of minutet vto put on and had an air pump…like those “bouncy houses” that you rent for kids parties. It filled it with enough air and then the testers used some kind of air cannon to propel ice balls at it.
It worked great and no damage was done to the car.
When I was in Oklahoma they had a lot of hail I seen where people would buy regular cloth car covers and underneath they would glue carpet padding for houses under them. They seemed to work really good. Made them about three inches thick and the stuff is pretty cheap.