I just added a 12v multi-function panel (2 USB ports, a cigarette lighter socket, and voltage indicator) to the side of the kitchen cabinet, tied into the 12 v line going to the under-cabinet dome light. I connected the panel with a cigarette lighter socket with an in-line 10a fuse, that way if the panel ever acts up I can just unplug it at the source. Also just like the ability to have an in-cabinet 12v socket if I ever need it (???). I used 12ga wire and connected the panel so the switch port controls power to the remaining panel ports.
Here's a link to the panel I ordered:
This will provide easier access to charging ports, and also a power source for the under-cabinet fan we use while cooking.
I'm planning to install another one in the cabinet underneath the tv, near the entryway.