No problem with staggered, most of the factory allowed fitments are staggered too.
According to many, you should stay within 1% of difference in diameter between front and rear tires (not this case, as it is slightly more) and in general as close as possible. If you want to follow that rule, you can consider 245/35+255/35, 235/40+265/35, 245/40+275/35, 235/35+275/30,... check it easily using
https://tiresize.com/comparison/ . You can find many examples of those fitments in the tire section.
In case your car is not lowered, consider fitting higher profile tires to fill the fender gap of x-drive (and get better comfort).