I used fuse 18 in the BCM box to power on the dashcam during startup. This fuse is for the wireless charging pad if you have one. I have no use for the pad so it works well for me. If memory serves, I used fuse position no. 24 for accessory power when the vehicle is off. This position also has the advantage of not being used, and it's very accessible. I think these two fuse positions have the least potential for screwing anything else up.