Create a block just under Category Header

Hi,

I would like to create a block under the Header of a category. The example is here: https://www.lluisribes.net/category/poemes/

I have a block (created with elements, it's the "Les paraules més comunes" with a cloud tag) but I'm not able to move it under the category header, before content. I try all the "Hooks": sometimes the block goes before menu, sometimes goes under each content, sometimes disapear but never just under the Category Header. What can I do?

thanks

Lluís