Focus follows mouse on monitor level

I have an external monitor with my macbook pro. What I want to do is to automatically focus the monitor when I move mouse on it. This way I would not need one extra click when I want to work in different applications opened in different monitors. I'm switching between these monitors quite often and this is annoying.

I know about focus-follows-mouse idea which means moving focus on a particular app when the mouse overs it but I'm asking for a bit different thing. I want to focus the monitor only (this probably means focusing the last active app on this monitor).