What if, after Sicily, the Allies try to bypass the Apennines, force a German withdrawal or trap them in the lower Peninsula, and attempt to quickly consolidate Italy as an Allied government, by invading Italy north of the southern Apennines? Where exactly, would they land? Latium? Liguria? All these landing spots seem to have potential chokepoints that could be held by the Germans? Would a northern landing have fulfilled the three objectives outlined? If not, would a northern landing have actually left the Allies worse off? If it did work, why didn't they do it IOTL?