It's very simple. Just texas-rig it weightless like you would a senko worm. Now you would be tempted to rig it like a fluke and run the hook vertically (the plane of the hook in the same plane as that of the shad). However, the body of the shad will not allow you for a good hook-set this way, so .... run the hook through the side of the shad and leave it exposed, or hide it weedless.
My personal favorite: I don't use it as a topwater bait. I slice with my fillet knife a tiny incision in the belly of the shad, right behind and underneath the head. Then insert a small (1/8 oz) bulletweight nose first until the weight is completely in. This will not affect the action of the shad. It will just allow it to sink vertically at a slow rate. Run it at whatever depth you like.