It really depends on what use you're going to put it to. Mine (on a Doomie) is on a home made bracket (ha ha, a flat piece of aluminium) which hangs below, and is located by, the nearside saddle bolt (I leave the side panel off as, on that side, it's purely cosmetic). I only ever use the socket to charge the battery, power my tyre compressor and, very rarely, power my heated vest. If you wanted to power a GPS, for example, somewhere near the headstock would be preferable. An advantage of the location I chose is the short wiring run from the battery. You really have to ask yourself: 1) What will I use it for and 2) do I want to hole a panel?