adding shoulder slots for crate or anything else

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Hey!! recently i created my p3d model of crate for my DayZ server. I want to use that crate for my mission system and it will be used for storing weapons loot. So i would like to add about 10 shoulder slots to that crate without cargo. I can do simple overides like changing cargo...thats no big deal but i am having problems adding shoulder slots or better said i guess problems defining/making shoulder slots to work.

( Just take in consideration i am just trying...i dont know what i am doing mainly and i am learning step by step )

I tried adding these parameters. With this added i could see 10 shoulder slots in my custom crate but not all of them were working... only 1st one was working and i could store weapon in that slot but i couldnt do that for other 9

attachments[]=
        {
            "Shoulder",
            "Shoulder",
            "Shoulder",
            "Shoulder",
            "Shoulder",
            "Shoulder",
            "Shoulder",
            "Shoulder",
            "Shoulder",
            "Shoulder"
        };

 

Can anyone help me what to do to make them work.

Also i would love to know how to make crates un-pickable from ground to hands or inventory/cargo. I guess i need to write simple script for that but as u read above i cant really write scripts 🤣 But thats maybe topic for another time