< you don't have a simple only 4-sided rectangle
is that i had remarked my rectangle was multi segmented but thinking that had no incidence of its center!

<If that known position is not the position you want, then why do you care where it is?
it's alway good to know the middle of something ;)

< The center snap will not be very meaningful
I was affraid because i had made my array curve from the center and not from the end of the path so result was significant at the extremities for some function
Now I will take the end of path :)
Thx for the help and explanation!

Line both sides + array cuve line + Project lines are very funny for obtain numerous profils without effort from any volum!