sony A6000 & Meikon housing....which INON wide angle to choose?

The lens is 24mm equivalent so you will need to zoom. If the glass is too far away from the port image quality will be awful. The only lenses that work well with ILC are the Panasonic 14-42mm mega OIS mark II and power zoom X on nauticam macro 35 or inon mrs port plus some of the old Olympus housings for epm1 epl1 and epl7

haven't heard of any good results on Sony mirrorless so you may want to check you records before wasting money