Thank you for the reply. The printers should give me ICC profiles for there presses no?

Also

Just to know what is the best practice (in general, not only if i need different CMYK ink max):

RGB image files and then when we make PDF, we target the CMYK PROFILE provided by the printer

OR

USE CMYK images that were already converted in Photoshop. and do no conversion when exporting to PDF from InDesign.