Without the Power Magic Pro, and hard-wiring directly to battery, could this be used instead? Would its inline fuse be okay? I assume that's what the black thing is on the red wire?
If not, could this be used instead then connect the cig lighter plug into it?
Yes, Both options would work and in fact I probably would have used the "NOCO GC018 12V Adapter Plug Socket with Eyelet Terminal". The only problem I see is the cable is too short from the 12 volt battery end and the cigarette adapter on the Dashcam will not fit through the rubber plug on the Model 3 (unless you thread it from the dashcam end, which means pulling the entire length of the cable through the rubber plug). In the future, I think I will use the link you suggested and get a little smarter with cable management.
Thanks a TON!