I solved it myself but in a not very productive way:
If I connected all the Set World Location of the collision boxes to the same GET, the boxes were all moved to the same position along the Cable. So I took the whole operation that comes after the tick event up to the GET and duplicated it 7 times connecting the collision boxes to each GET and each For Loop, changing the value of the last index for each For Loop. Now I have the boxes arranged along the cable at equidistance.
But this solution (also because of the tick event is not very recommended I think) so many of these cables would weigh down the game.
So I opted for a single collision box fixed to the center of the cable that updates its length based on the start and end of the Cable. (only because in my case the cables must be well stretched)