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You might find this is a ad-hoc solution but I have connected a four way splitter for the cigarette socket to the cigarette socket wires inside my dashboard and hidden it behind the glove compartment. Here i have plugged in the cam, an outside temperature display, the TomTom GPS, and sometimes the CB when i go to offroad meets.
The fuse is still the original one.
this leaves the original 12v socket free for a mobile phone charger or whatever..
I've hard-wired a dash-cam into the wife's Vauxhall Meriva.
It was very simple and easy to do and all I used was a "piggyback fuse" taking power from a relatively unimportant and little-used source (the rear wiper), some suitable automotive wire, some crimp connectors, and an accessory cigarette-lighter socket. It cost about one or two £ in total, and about 40 mins work neatly routing the cable, connecting it up and testing it.
It's now been in the car for several years, works faultlessly, and is far better than having power sockets all over the place and wires draped around the dashboard.
Some people are a bit afraid to use a piggy-back fuse but they are 100% safe even when wired incorrectly; there is a very good YouTube article discussing this and even wiring it in all possible incorrect ways to prove/disprove the theories (I'm at work at the moment and YouTube is blocked otherwise I would put a link to it)
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