I didn't get to drive the car today like I thought I would and I probably won't drive it again until Friday in which I'll be driving down to see the lady. I'll test both locations you mentioned. Right now I have it where the jack would have been.
I can mount it either in the front or the back. I have a usb hub in the front. If you think the front would be better I'll put it up there. When you say "under the dash pad" are you referring to the space right behind the stock radio?