My new house has a frameless glass shower that appears to be held to the walls with nothing but silicone caulking. I don't know anything about these kinds of showers, but I did think they usually had some sort of brackets or other attachment to the tiles.
The two fixed panels are attached to the wall, ceiling, and plastic basin using silicone. The panels aren't inset in the basin; one side has rotted silicone on the bottom that has detached from the basin, and I can move it. They don't appear to be inset in the wall or ceiling at all either.
I can't see any sort of fittings along the walls or ceiling and the glass doesn't seem to be in any sort of sleeve.
The door is attached to one of the panels, which seems like a lot of torque on a panel that's only held on by caulking.
The glass is about 3/8" thick.
I think this shower was installed about 15 years ago, and has apparently survived without issue, but I wanted to check to see if I should be doing something to reinforce it.