factory ground location

Does anyone know where an easy to access factory ground bolt is located?
I'm running wiring for heated seats. I have power coming from a fuse tap under the glove box, but I'm just not seeing a good spot in the area for a ground bolt. I guess I could tap into a ground wire as well, but I'm not even sure which wires are grounds.

 

Kick panel just below the glove box? Most vehicles have some grounding points there.

 

There is also a one under the each front seat carpeting I believe. That’s where the factory amp was grounded and the seat electronics on my 2019 anyway. Thinking that would be the same

 

Yeah I'm not seeing one in all the "usual places".

 

Door pillar, ether side about 10 inches high. That’s the one I used for the power board contacts ground. Look for instructions on how to install power boards ether brand and you will see the location