Ideal 16x7 Offset for flush sidewall to fender?

[AmosCake]

As the title suggest, what's the perfect offset, front and rear, for 16x7 rims to have sidewall of 205/50/16 tire flush with the fender(Which is rolled) WITH NO SPACERS.
Car is lowered on H&R Sport Springs

Im thinking....
16x7 et15 in the front
16x7 et5 in the rear?

Pics would be much appreciated

[Malice]

probably et0 or -5 rear offset. I had 16x8 diamond steelies et20f and et0r on those tires and there was still a little gap with fenders unrolled