Correct, the Inverto will be mounted vertical and "0" aligned with the dish's polar axis.
The KU scalar should be mounted as close to the C-band feedhorn as possible and almost in line when the dish is parked at the top of the arc -due South. You probably should cut the C-band scalar to fit the KU scaler inserted as close as possible to the c-band feedhorn, then use a few flat straps and machine screws to attach. I don't have any photos, but several member offset multi-feed projects show the scalar cuts and strapping.
The KU scalar should be mounted as close to the C-band feedhorn as possible and almost in line when the dish is parked at the top of the arc -due South. You probably should cut the C-band scalar to fit the KU scaler inserted as close as possible to the c-band feedhorn, then use a few flat straps and machine screws to attach. I don't have any photos, but several member offset multi-feed projects show the scalar cuts and strapping.