Superb 4x4 170 Hatchback....Tow bar bike carrier?

Has anyone actually fitted a tow bar mounted bike carrier to the detachable tow hook on the Superb Mk2 ?

I'm hunting for an economical carrier capable of carrying two bikes - that can be locked to the carrier & in turn the carrier can be locked to the tow bar.

There are lots out there & many are very expensive...few meet the parameters; I planned to add the necessary additional lockable cable, however it would be nice to have locks already in position.

Anybody got a used model for sale..?

Thanks,

TDM.