I've had great success in my past 3 vehicles with Ram Mounts, my TC needed it more than any other, you ain't kidding, no space available!
This is the Ram Pod 1 Universal No drill with an X-grip, mounts to seat bolt and positions perfectly, the x grip will accommodate iphone 4 through iPhone 6 plus easily. Other manufacturers of course but I know for sure about Apple. Rotates sideways for GPS and landscape mode.
http://www.rammount.com/images/rec/RAM-B-316-1U-10.jpg
Best prices on Amazon
To mmontminy, very nice find on that panavise mount, thank you. Also the Ram Mount suction cups are the best I've ever found,they just won't fall.