@CaseyBrown
If the MX and MR are in the same (combined) network, then you have the option of altering settings in the Group Policy that affect just wired/wireless filters. You'll see "Wireless Only" and "Security Appliance only" in the group policy settings page. Here, you can "use network default" (follows the network-wide rules), "append" (adds to the existing list of rules), or "override" (creates a completely new list of rules and disregards the network's).
In this instance, you would create a group policy that overrides the network-wide list (make sure to include anything that should still stay), then apply that policy in the Network-wide > Clients list.
If the MX and MR are in different networks, then you'll have to manage separate policies on your MR and MX for that client, both of which would allow Netflix.
Hope this helps!
Zak