Here are some pictures of scoped doubles (scope or red dot sight). EAW, Maklik, Recknagel, Poli and other make pivot mounts. Recknagel mounts as EAW are available for 99% of double rifles and good gunsmith can adjust them for the 1% left. They sell also all the parts for claw mounts.
Dom
Zoli double with Leupold Hog scope and Recknagel mount
Haenel double with Aimpoint Hunter34 and Merkel mount
Pair of Chapuis with Recknagel and EAW mount, SwaroZ6 and Aimpoint 9000
Merkel141 SxS with Zeis Victory and EAW mount
Express Merkel B3 30R Blaser with Merkel mount and Leupold VX7