[Jack21]

The position of the caliper on the rotor makes no difference on the behavior of the braking system, or the car.

The caliper, however, must clear, and not interfere with other suspension and/or steering components, as some of you who have attempted to install aftermarket, or non-OEM braking components have learned.

And some aftermarket suppliers (Baer, Wildwood) are more willing to work with you with resolving your caliper/control arm/strut rod/ wheel (etc) component interferences than others (SSBC for one).