Child Safety Invisible Cabinet Lock

I based this desing on thing 28037, improved the screw holes to be easier mountable and added a part where the hook can grab to, as most of my cabinets do not have anything which could be used for a hook.
I do not like the outside approach, where the hook is placed outside of the cabinet. So the hinge can be mounted inside to allow the hook to grad to.
Let me know what you think and it would be awesome to see some makes.