If it’s brand new, I strongly recommend passivating first with citric acid. Soaking in citric acid removes free iron at the surface, then the chromium will react with oxygen in the air to form a protective shiny barrier. I didn’t passivate my kettle first and got a small buildup of iron in the trub and some slight staining. It’s not a big deal and the beer is totally fine, but I still would do it if I bought another one. I just let it soak in acid, then wipe it clean with a paper towel (while wearing gloves) and let it air dry. Citric acid also removes beer stone from kettles and is pretty cheap.
Feel free to make whatever you’d like, but I see no reason mead posts can’t go in homebrewing. I don’t make mead, but still would find the posts interesting.