Double Undead and double Hellborn monsters?

[Dunmer999]

I have two questions, but they're basically the same thing about 2 monster enhancers, so I hope it's okay.

I know some people have asked about monsters from Hell, and it's just flavor text, but I want to know if From Hell could be played on one of them for an additional +5 (or +10 for Clerics).

And can an Undead monster have Undead played on it to make it stronger? (I guess it'd be some kind of advanced zombie.)