After exchanging the passenger airbag cover, I discovered the perfect spot for my Kenwood active Mini-Sub. Yup, facing downwards, right under the airbag.
There is enough room and clearing space to the airbag system. Will cut a hole into the dashboard, attach the sub inside with 4 screws and cover it with a modded Kenwood mesh.
Going to use my favourite tool for that:A multi cutter, much faster than my Dremel