This plugin looks promising. You should if possible try and incorporate a menu to allow clients to change to third person view instead of having to do it threw console.
I know theres a plugin already kind of like this but when I tried it on our server third person could only be done threw console and it involves sv_cheats to be enabled even though the plugin had a anti cheat so clients couldn't use cheats there where allot of commands that wern't blocked like mat_wireframe. I'm not aware if it was fixed.