I don't have an accord of the year you're asking about, but I do have bolts behind each backseat in my car and they work perfectly. I didn't even have to sand down the metal beneath each bolt but I probably will once I change my current setup again.There are two nice grounding bolts if you tilt the back seat down and move the felt covering out of the way you will see them a little tricky to get a socket wrench on but an open end wrench works fine. Unscrew it the rest of the way by hand and don't drop it or you will be taking the seat bottom out.
Make sure to sandpaper the paint off under them prior to mounting your ground wire.