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Because they are not counted as a pop, it seem you can have as many ghost heroes as there are graves.
Edit: You can also pick up hero bodies from the undead unit's graveyard as long as you do so before they turn to bones.
Ghost Heroes are displayed in the pops icon, but notably says "(free)" with a red bow tie on it. They are also just not counted in total pops, that being said, I've built up to twelve and can seemingly build more as long as I have the space and resources.