E53 2020 with 20in Rim option, staggered 245/275

I believe winter tires on 20in low profile is not optimal, as well as a staggered setup for winter.

I read that I could go on a 19in 245 all round square setup.

What would be the ideal rim size to make that setup? I'm looking at the Braelin BR10, 8.5 width, centerbore 66.6, 5x112 bolt pattern, but I have the choice of 25 or 35 for the offset ? Would I need 25 front and 35 rear?

Thanks

Check possible configurations at wheel-size