There certainly a few spare on mine, repair wires for the terminals to add extra fuses to that fuse box is quite easy and is covered in my reverse camera retrofit.
You are of course correct that the supply to the parking module is protected by its fuse but I like the idea of extra protection so if the relay was to fail it doesn't take out the parking module at the same time, admittedly it's highly unlikely.
Can't believe none of us thought about tapping into that module before for the switched live.
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