Ummm not entirely sure what you are asking, but you can bring up name plates with v or control + V , I think. Alternatively, you can get an addon called plater, that does pretty nice plates.
I don’t think that’s possible or allowed so your best bet are addons like the other poster mentioned.
I know that some people pointed out they would like to see changes to the nameplates in the new UI for DF exactly because of visibility issues so I am hoping they get tweaked as I love the idea of ditching a bunch of addons. Specifically, the nameplate addons often cause errors.