What do I need to change the case?

Hey Guys, so I just ordered a 60HE+ with white key-caps. Now I'm thinking about getting a white case aswell. But now I'm a bit lost. Do I need one of those plates aswell? I just see, that some people use it and some don't. Is that depending on the case or is it just for a different sound of the keys? So can I just switch the case into a different fitting case or are there more things to look out for? I'm Not deep into modding keyboards (yet) and just want a clean, white look combined with the good performance of the wooting and not want to change the sound of it or anything. Thank you for your help, I wish you all a nice day :)