Luiz,
The problem is that a Content template does not contains any position information and does not know any position in advanced. Only in the layout template, you can control positions and add modules.
Do you see possibility to add it at the layout template. It can be done the way you described, as long as it is a layout template.
Do this answer your question? Do not hesitate to ask again if there is still question
Regards,
Vincent
Kooboo Team