I have a socket ready to fit in mine and am also watching....
Glovebox is most likely location. Tapped into the wiring from ignition switch so its not powered unless ignition is on? Fuse link also ready. The between the seats option is handy too, but don't want leads running to satnav through cockpit area to get in the way so glovebox is No1 choice. A second one is also a nice idea between seats. I may look to make a consol for this area over transmission tunnel and it could be fitted there.
Oh the jobs to be done!