One of my friends runs a granite countertops business and has stated to me that backsplashes are sealed to the horizontal surface with silicone adhesive.
In a regular kitchen setting i am not sure if they would use construction adhesive to attach it to the wall or silicone there as well. I'm told it's basically construction adhesive between the granite and the plywood that supports it.
I suspect that if the granite is all properly secure, you could silicone the topping rail to the granite backsplash and it wouldn't move for a long while, but i might prefer to have some metal brackets as well.