It will always be protected by the fuse, but if inserted the ‘wrong’ way round, it will in fact be protected by both fuses rather than having one for the original circuit and a separate one for the new circuit (dashcam in this case). They do usually need to have the cable exit to the left on a T6 to be installed for separate circuits. The diagrams below may help (stolen from another site). Simplest test is if the dashcam stops working when you remove either fuse then it is wired as shown in Position B below.
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