Again, just my opinion... since each LED tape light will be in a different location/room, etc, I don't see a problem adding multiple IR controllers. Each scene will be turned on/off independently, and if coordination is required, it can be done with an advanced lighting scene.
That being said, I don't know what you can do with DMX that you can't do with basic LED controllers. Nor do I know the cost of the Z2IR type solution.
Good luck!!!