Mount them on the other side of the disk. Or possibly next to the regular caliper (above/below). Regardless of which way you go, you'll have to fab up some brackets for them.
Another thing that has been considered by kit-car people is, if your car has a CV joint right at the differential's output flange, to sandwich a thin rotor between the flange and the joint. Then mount the caliper to the diff.
-soD
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