We are putting in a frameless shower, and our contractor thinks we need more support than the architect specified. I'm wondering how others have handled this.

Our set up is very similar to this:

The total length is 84", height 84", door width 30". The panes on left and right are supposed to be fixed using silicone and recessed channels on the bottoms and sides into the floor and walls. GC doesn't think this will provide enough support for a hinged door in the middle and that we should provide some sort of support on the top to attach it to the ceiling, which in our case is the same height as the glass. He proposes another channel, but not recessed into the ceiling.

I'd prefer a more minimal look and think the extra channel sort of defeats the point of a frameless shower. But obviously I don't want a bunch of glass to fall on me in the shower! In the photo above, I see they use clips on the sides and bottom instead of silicone / channel. Is that more secure?

Has anybody else handled this, and what did you do?