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The front and rear are different functionally, MacPherson strut in the front and multi link in the back. So you can't really say what's good for one is good for the other by correlation.
That said, you probably want over -3 up front and between -2 and -3 in the back if you have grippy tires and are really pushing the car. There's a point after which you lose cornering traction and forward grip with camber in the back, but finding the sweet spot needs data. It likely depends on the tires, tire pressures, and spring rates.
I think -3 is too much though.
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