I added ratchet straps from the same 2 locations on the hatch lid. They go inside to secure on the shelf. This makes it secured from the inside of the teardrop. I don’t need outside locks at all. If it starts raining hard during the night I can just tighten them up from inside too.
There are metal loops secured onto the hatch. Straps hook into there and go through a small slit in the tabletop of the galley. Then the straps secure to the ratcheting part that is screwed into the bottom of the shelf. I can unhook the straps in camp if they are getting in the way or leave them attached.