With the image stormchaser provide, the 15A blue fuse at top right, has no wire behind it. It is a PWR_OUTLET2. You can also see there is another 15A blue fuse below it (3rd from the upper right), it is PWR_OUTLET1 that currently goes to your cigarettes lighter plug and other things.
While PWR_OUTLET2 is open, I tapped and inserted a wire behind the fuse box and it is a live circuit. I believe it is what you want and I am currently using it to supply my radar detector and dashcam.
While PWR_OUTLET2 is open, I tapped and inserted a wire behind the fuse box and it is a live circuit. I believe it is what you want and I am currently using it to supply my radar detector and dashcam.