You can see the screw in the 2nd pic. The 3rd pic shows what I believe is the access? But it’s about 1 1/2 inches up that gap before I connect with anything. So honestly no idea
I don't think that screw is holding the cover on. Have you tried to lever the cover gently ,using a wide flat bladed screwdriver In the slot at the bottom ?
1. I suspect the "access slot" is actually a drain point to allow water out.
2. I'd expect the two outer chrome rings to unscrew.
3. There's a good chance the plate has been siliconed to the wall.
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