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where belts or seats are fastened are usually NOT good spots.
You are better served to create your own ground. This is because you need contact to BARE metal. Using the bolt holes of a seat is not a good idea for a few reasons.
The threads for the bolt hole are usually covered in paint and have a bunch of garbage in them. This will prevent you from getting a solid ground.
Usually when you ground to a seat bolt, you're on top of the carpet. As such, you're only relying on the contact with the bolt, which then makes contact through the threads only for a ground. This is not a solid ground, no matter how you look at it.
Drilling into the car in the right place will not devalue the car in the least. Do it in the trunk under some carpet and you'll be fine.
Don't be scared to drill a small hole in the car. It's a needless worry.
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