Limit post top level categories to one

My website have many posts, ~9 main categories and “unlimited” subcategories.

I’d like to force in WordPress panel that you can’t choose more than 1 top level category but you can choose unlimited subcategories of this main one.

One plugin changed checkboxes into radiobuttons and it works great but only for one level and I need more depth.

Is there any way to do that? Thanks in advance.

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