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The rear hook is easier to install, but you really need hooks or straps at both ends if you spend time on track. I have worked with the recovery team pulling cars out of the gravel traps, and we appreciate an accessible point to attach our straps. You never know which way your car will be pointed off-course, so hooks at both ends provide more (and safer) options for the people trying to help.
I think it would be an asset on a street car if you had to get pulled up onto a flat bed in the event of a breakdown. I've thought about it many times but never got around to it.
A year ago, I had to have my C5 coupe towed when it broke down. I called AAA and they sent a flatbed rig. I told AAA that the car was lowered but they said most all flatbed tow rigs carry wood for extended ramps.
So when the guy showed up, he had a hell of a time finding a place for the cable to hook to the car. Not only because the car was low, it was because there was nothing easily reachable to attach the cable to the car.
A tow eye at the front would have made the cable hook-up a 10 second job. Instead, the poor guy took nearly 20 minutes on his back trying to find a place to attach the cable. And that was during a rainstorm
So I would recommend installing tow eyes at both ends if nothing else for providing a quick hook-up to the car. Most of the tow eyes I have seen on cars that see track use are red or orange and that's a safety deal so track workers can quickly find the tow eye.