The fuse in the back of the car protects the wire going to the battery. Incase you do have a short, the fuses in the back are usually a lower amperage (not in your case) On a dead short its still tough to blow higher amp fuses (I had a battery in the rear fall over and not blow a 200 amp fuse) It is just a safety precaution. If you had more than one amp then a fused distribution block would make sense, but with just the one amp you should be ok.
