I ran a power wire from the battery into the cab on its own 30 amp fuse to a 4 pole "Rig Runner" under the dash. Initially it was setup that way so I could install a couple of other Amateur Radios and a GMRS radio, but I just have the 1 Ham Radio installed right now, got rid of the CB a long time ago, nobody uses them things anymore for the most part unless you are in small groups, many just use GMRS or FRS radios of one type or another for group use. My CB I think I'm going to put back in because its nice to be able to hear truckers and communicate with them but for the most part nobody else uses them it seems anymore. I need to replace my Amateur radio and going to be relocating it so my CB is going where it was, and my Amateur radio I think I'm going to mount to the console I think it got too hot sitting down low on the dash and fried the speaker output as I have no audio from the radio anymore, of course it doesn't help that its a cheap Chinesium radio but still.
For your use with just a single radio, they only require maybe a 10 amp fuse, so just run a power wire direct from the battery with a fuse at the battery, then into the cab to wherever you want to put the radio. I'd stray away from wiring stuff into the fuse panel, its just easier to run a single power wire direct to your accessories.
Attached is what I installed for my radios. But in your case its overkill with only 1 radio. I did that with future radio additions in mind.