First , This is my server
I have added mods and they do work, not sure if it's they exact way its supposed to be done, because there is no info on this site from Nitrado whatsoever. Threre are only link leading on how to do it for pc servers, which will not work the same as the Nitrado server. But this is what I did.
I added the @ Folders to the Main folder( the folder that you are showing in your post.) You go in to the @folder(ex. @CF) and open the addons folder
and copy the files inside
These go back to the root folder and get pasted into the addons folder
This is where I added the start up commands
This is all that is needed on the server side as far as I know. The thing for me is that it wont work unless you copy the addons to the dayZ addons folder in your steam folder. Which seems weird to me. steamapps/common/DayZ/addons. I hope this helps you. This is how I got i working for me. Just for testing, you should start with just 1 mod. I used unlimited stamina, because it would be the easiest to test out, being that you can see it works right off starting the game. Hope this helps you. I'm gonna keep testing to see if I can get it to run without having to add the files to the steam folder. I will let you know.