This is a seat back mount, laser cut and bent from stainless steel by a Rivian owner located in the Pacific Northwest. Rock solid once installed, it has a standard threaded stud (like you'd find atop a tripod) with many, MANY different uses.
For those of you with kids - throw an iPad mount on there like the Joby GripTight Pro mount.
If you want to capture an interior view of the cabin while driving, an articulating arm gives you the flexibility to throw a GoPro/Insta360 right over your shoulder.
We're sure there's many other uses we haven't thought of yet - and would love to hear what you've got in mind!