Roof Rack Mounting Brackets Gutter - Mount Hardware for Rain Gutter Vehicles Cross Bars Roof Top Tent Black,17-19cm

The Pic you posted is exactly what that is though. Basket with drip rail mounts. You can either do a cross bar, they all vary in height, some are pretty low profile, or they sell drip rail mounts specific for baskets. Like so: https://www.amazon.com/dp/B0H4GKKGFG