Magnetic door-stop

We have two cats. Whenever they sit near the doors of my house, I am always worried because the door might slam shut with them sitting near the doorway. That is why when I came upon this magnetic door-stop, I decided that this would be the best thing to use for the doors in my house, especially the ones that slams shut all the time. My house is pretty windy, I admit so that is probably the reason why I feel so worries about a cat being trapped between a closed door. Now, all I have to do is find some time and screw it in. The measurement needs to be precise or else…it may not work.