Originally Posted by Yak

It probably depends on what device you plan on using. There's a oval grommet on the firewall below the battery. It's the one the A/C lines route through to get to the evaporator. You could fuse the line at the battery, route it through the firewall through the probably-degrading-anyway rubber in the grommet.

You could use that line to supply a receptacle in the glove box, or try for custom receptacle in or on the console. Amazon and ebay have some.