This is a 67 Designs brand phone mount. I had it mounted at the top of the center bezel where they recommended but I suppose you can mount this wherever you find possible. $40 + shipping or local pickup.
This was their first TJ mount they made and sold up until they just recently created that rail system a few months ago. I’m not a fan of that big clunky rail but if you want to get an idea to what this one is it’s the exact same one in this video.