I hard-wired a dash cam in my Skoda Yeti using a piggy-back fuse (e-bay) connected to the fuse for the rear wipers, running the cable under the headlining, then under the edge of the screen pillar and between the dash and base of the pillar, then down the door rubber and into the fuse box which was located at the driver's end of the dash. Looking at my Tiguan, the same route/connection looks feasible though the location of the fuse box behind the glove box might make it easier to conceal the cable.