The best effect is usually achieved by fixing your LED strips to provide downlight (i.e., installed facing downwards on the underside of your shelves). As with cabinet projects (fig 6 and fig 7 above), be sure to position the LED strips behind a lip, or if there is no lip then the strips should be placed further back, so they are out of sight.
The typical wiring solution for most bookcase/shelving projects is to use an electrical connector block. This splits the power feed from the LED transformer, in order to provide multiple parallel feeds to each LED strip (fig 8).
For more information on connector-blocks, see our connecting LED tapes support page.