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I thought it would be fun to get a dashcam, so I got a well-regarded, generic one often called a B40 or A118, which a friend recommended.
Got a cheap 2A USB cig adapter, disassembled it, and hardwired it to the main fusebox, to position F55 (that 2A fuse at the top left end of the fusebox), which is one of the few areas that gets switched power.
Where are you tapping ground? I had mine attached to a screw on the airbag module, but decided to take it off because...well...airbag.
I put a ring terminal under the stock ground point (x3294) under the doorsill. The comb connector itself was full so i couldn't use that. That's where the OE dashcam (Advanced Eye) gets it. I was originally going to use an unused speed clip next to the footwell airbag module, but decided to go down to the factory point.