Echo 56V charger easy wall mount

I have an Echo 56V cordless electric string trimmer. Cordless electric means there is a battery charger to take up space. The charger has keyholes for wall mounting, but I don't like having to use a tape measure every time I change my mind about where the charger is going to go. 

I came up with this. This design needs a couple of M4 heat set inserts and a couple ~12mm M4 button head screws. Use the heat set inserts and the machine screws to mount the charger to this little board. Then use the constellation of counterbored screw holes to fasten the mounting board to your wall.