My theory when running wiring on something like that is run lots more wires than you think you need while the walls are open and easy to get to. Both 12v and 110v. If you think you might add something later, run the wire. You can just leave them unterminated inside the wall or ceiling, and label each end. That will make life way easier when you remember that one item you forgot to run the wire for, or add something later. I know wire isn't cheap, but I figure the cost is way easier than fishing wires through impossible places later. Even just if you drop from your main switch panel or breaker box down through the floor where you can get to the wire to extend it later would be nice.
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