Safest way to add accessory wire

[BlueSQ]

I have a Sirius radio adapter and a bluetooth adapter that are both 12v and take 16 gauge wire. For the past few months to power them, I tapped into the distribution blocks for my amps, and ran the accessory wire safely under the carpet. What would you suggest as a safer way to wire this, or is this just fine?

[bobduch]

This is fine but add an inline fuse near the distro block.