You can add the ability to hide NameTags?
NameTags makes the player visible through the walls.
I want players to not have NameTags.

Hello,

Nametags are hidden if you use vanish. However, if you using 1.8.8 there is a bug that cannot be fixed.

Kind Regards,
Cory

This isn't available in NTE (right now) as far as I am aware - but this is possible in Vanilla minecraft (and could be added in a PR to NTE potentially)

If you create a scoreboard team and add all your players (or players who need the scoreboard) you can use the "nametagVisibility" option to hide this.