We have made further improvements to nameplate stacking that is now live on Beta. These changes should prevent nameplates from going below the unit they are attached to, and they should no longer shuffle positions in the stack as often.
We are aware of another issue where units in separate packs will sometimes have their nameplates overlap, and will be addressing this soon.
Thank you for your feedback and please keep sharing your thoughts on stacking nameplates in the feedback threads here (US) or here (EU).