Double hooks rigs are intended to be Grass Shrimp rigs but I use them for everything. I figure it gives you a second chance especially with Grass shrimp, which will come off with just a single tap.
I also always hang the slider on the rig itself, 18 from the hook on a 48 leader. Because of the areas we generally fish for Sturgeon (sandy or muddy bottom), at least in the Delta and Bay snagging is rarely an issue. Its been my experience that when you do snag its usually the hook snagging a lost anchor rope. Found a lot of anchors that way. Probably more of an issue up river though.