Basically solar covers "float" on the water. Since they sort of "stick" to the water when wet the only time they might blow off is in a huge storm, even then with the lip around the pool it is pretty unlikely to get wind under the cover enough to lift off.

Most people use a reel and just roll them up when not in use, but you could just drag them off in a pile, just a little more work getting on and off. Our pool is rectangular so it is pretty easy, but in an "L", peanut or other odd shape a cover might be more difficult to get on and off. You can see our rolled up at the end.