You should do what I did & get a 4 in 1 power socket. Whip off the end, wire it to power block under dash & then locate in the cubby hole to the left of the drivers knee.
This gives you 4 sockets to use, and you wont need to fuse anything as the items you plug into it will have their own fused "male" sockets.
I hardwired my sat Nav & Road angel & have 2 free for future investments......