Being a 2010 model I am almost certain that you will find a lighter socket under the right hand side of the glovebox facing down towards the floor. It will have a flip off plastic cover that is held on one side.
Finding a place to mount the sat nav is another story (there is a thread on this topic). If you have the walnut dash the surface is probably smooth enough and shiney enough that you can stick it onto the dash up high between the glovebox and the instrument panel. That is where we put ours.