I would suggest the following, 2 different brand cameras, each with a different lens and gps mounted side by side on a stable tripod. Should make dust, lens flares , dodgy pixels, camera artifacts, focus issues easily detectable. If it is not the same in both cameras, it is not there. It is a lot harder to fake if there a multiple simultaneous images. The biggest advantage is getting to sell twice the amount of equipment
If the customer gets bored with ufos, the same setup could also work with ghosts and yetis.
Additionally some astronomy software showing stars and satellites wouldn't go astray.