I think it would be best to have the conduit feed directly into a weathertite junction box mounted to the corner mount, or if you were to not use the junction box, at least feed the cabling into the cameras wall mount arm and then seal the back of the mount and conduit ends. Bees love to get into those openings. Lots of fun coming back a year or two later to work on the camera and getting stung by bees while 20 feet up on a ladder.
Also using direct burial STP cable if the camera is outside and the cabling is exposed.
Also some cameras have weathertite caps that go over the RJ45 connection. Using those with some silicone dielectric grease on connections helps with the oxidation on the connections.
That corner mount definitely needs more fasteners.