No, they aren't really corpses in the way Foster's magic would be looking to affect. It's more like they are functioning on magical life force instead of an organic one.
I'm not sure what qualities a corpse has that his magic is specifically attuned to, but since vampires already have two souls inside of them, controlling them, it doesn't seem like it'd be more effective than use against a living body.
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I'm not sure what qualities a corpse has that his magic is specifically attuned to, but since vampires already have two souls inside of them, controlling them, it doesn't seem like it'd be more effective than use against a living body.