The problem you will find when manufacturers change spec is, although the wiring is there, theres often no 12v power when you come to retrofit as the manufacturer as omitted insta;;ing the fuse. Even when you look in the manual for the fuse location you will often find installing a fuse makes no difference. Getting to the fusebox often requires removing the glovebox and disconecting some of the wiring harness plugs to get full access to the fuses and to do any meaningful testing.
From memory fuse location 7 is for the boot 12v socket and either 15 or 16 for the front 12v socket on the Grandland “X”