just remember, y7ou want to match the fuses to your wire going to the amp rather than the amp itself.
Your amp has its own fuses to protect it. YOu need to protect your wire feeding your amps from burning out, therefore must put a fuse in that would be rated to that.
That is also the reason you put it as close to the battery as possible. No use in protecing your amp when the wire fuses and burns your car out because your fuse is located in the boot.