Yes and yes. Piggy back fuse replaces the original fuse then that original fuse goes in the back of the piggy back fuse along with a new fuse so both piggy back fuses should have two fuses in them....if that makes sense.
You should be able to work out which socket on the piggy back fuse is for the new fuse and which is for the old fuse by looking at it - The socket with a cable coming out under it (for the new wire) will be the new fuse socket.
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JamesVRSmk3's post in blackvue power pro was marked as the answer