Fixed element position relative to % of a group

Everyone, I am trying to realize a showroom, and I was wondering is it possible to fix an element position relative to a group and that x/y would resize in the same time as the group to always keep the same position on the group.
Picture, always make it easier to understand ao here is a picture of what I am trying to do :

1/2/3/4/5 are clickable, but I would like my image to be as big as my page.
So I need the button x/y to be depending on my Group element height % to stay on the same position.

I am a bit stuck here, for now I used floating group but I would prefer if anyone of you as a better alternative.

Thank you in advance for your help.

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