Yes, that should be fine. If I were you I would t-tap from behind the power point (looks cleaner) and check to see that there is a high enough fuse on it that you won't blow it. Make sure you don't blow the fuse. You will also want to find out if it is a switched power supply or not....is it on even when the car is off? You want it on an unswitched source, but need a connection to like a cigarette lighter that goes on and off when you turn the car on and off to tell it when to power up and shut down.