What’s typical? Typical is a flat countertop that butts up to the back and side walls at a right angle. If the backsplash is solid surface like the countertop, then the backsplash piece, which is often 3” to 4” tall, is glued to the wall using thumb size daubs of silicone. Between the countertop and the bottom edge of the backsplash is a bead of silicone that matches the solid surface.
Other backsplash options are numerous with one of the more popular being tile strips for the backsplash.