Add a static mesh relative to the precedent added


I want to make a procedural level by using the construction script, I want to add a static mesh relatively to the precedent added, I got all the info of offset and rotation.

My problem is due to the relative location of the news static meshes.
They are only relative at the staticmeshactor pivot.

Does someone have an idea ?

Maybe you need further informations I didn’t gave ?
Thank you for your time