https://www.google.com/search?q=infinit ... 60&bih=508
searching for "2011+ qx 56" will yield more results than just using "qx80". other than the name change and the front end bumper and wheels, its the same car as earlier models 2011 to present (give or take a small option or two).
that search will yield some images of the cargo liner. you can also go to infiniti.com and look under accessories or check fleabay.
there is no difference in the interior of 2011 to 2016. what fits in my 2012 qx will fit in your 2016. maybe there are different color schemes , as with any car manufacturer, but the "build" is the same, if that makes sense.