Why is Codelock placed under turret, flametrower and refinery? And the codelocks on turret, flametrower and refinery only appear when i have used it on doors or chests first. I like that we can have locks on all this items, but find better placement.

can you please answer?

I have noticed this too.  It also happens to metal shop fronts.  I'm guessing that the config needs to have a bunch of items added to it until it's just working on TCs, Doors, and Boxes.  Problem is, it uses prefab references instead of shortname.  I found a list of prefabs here:  https://github.com/IvMisticos/Rust/blob/master/Game%20Info/Prefabs.md

Unfortunately, it's not nearly as straight forward as just using shortnames.