Not sure of the benefit of the extra 5mm but I'd do it like this guy ^^^^ and get the extra 10mm on the tires!

 

I can't speak for the 5 mm, but I made a big difference with 7 mm compared to original. People who didn't know about them, asked because the thought the care looked much wider than before.

Because I have changed the to more negativ cambers I will put on 15 mm instead.