So, I had discussed this in another thread (
https://www.theineosforum.com/threads/hard-shell-rooftop-tent.12411517/post-1333193363) and am not convinced that a standard gutter fixture will do good to the gutter, if mounted to the outside, and that is because the gutter is more than 30mm wide, compared to some 5 mm on a classic Defender.
I did now, for my roof tent, move the fixtures to the inner side to reduce the lever and thus the pressure on the gutters and hope this will work fine. Makes a good impression so far.
I achieved this by adding some tailor made PVC blocks in, here's a photo:
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