A couple of ideas, no idea if it's possible to realise them:
Some different anchor options for the mob's name like for the health text would be great.
Mobhealth/Mobinfo values for health/mana
This doesn't seem to be working for me? Do you have to be in a party/raid to see them? Or do i need to enable "v"? Gonna try that now
If you don't have nameplates enabled, you of course won't see anything at all.
In the default Blizzard interface, there are three settings for nameplate display - Hostile/enemy only, Friendly only, and All. There are keybindings in the Blizz binding interface for those settings, though I believe only V as Enemy only is bound by default.