Hello,
In theory there is no filter limit associated with your module.
Now for the rest, the answer will depend on your needs, that is to say:
Either, you need to have results on all of your products.
=> So no need to restrict by product category.
Or, you want to ONLY search in the category that only matches the displayed category.
=> Then you will need several filter modules each with the corresponding filter (i.e. restricted to the category currently displayed on the Item Menu).
Hope this will help you.
Regards