CCUs don’t generate timecode.
You want to get a timecode generator and an audio DA. I don’t suggest looping timecode from one deck to another. If 1 deck goes down, you could loose timecode on both decks. That’s where the DA comes in.
Also don’t forget to genlock your timecode generator to the same reference signal as your cameras and decks. If you don’t, your timecode will slip. On some generators it labeled reference in, but on others (just to try to confuse us) it’s labeled Video In.
Seth