Free Run Timecode syncing two 6D mark II bodies

I wanna sync my two 6D mkii bodies for an upcoming video shoot. Would I use "manual input setting" or "Set to Camera Time"? ++https://192168ll.onl/ https://xender.vip/++

The end goal is for creating a multicam clip in final cut pro have them in sync and freely cut back and forth between the (hopefully) synced cameras angles.++https://testmyspeed.onl/++

I'll be shooting non-stop with both for about 30 minutes and would really prefer to not sync with audio or manually sync with a slate