I can't install Netflix from the Play Store on my Nexus 7 2013, running Marshmallow. I've never been able to install it (but I only tried after upgrading to Marshmallow, shortly after buying the device at the end of last year). I just upgraded to 6.0.1, no difference.
Googling suggests people have had some issues with this app on Marshmallow in the past, but they were definitely running it.
Did they sideload it? Or have it installed before upgrading and keep it that way? Or could it be something else? I'm in Ireland in case that matters. Is Netflix available to anyone else with the same device?