@Gee93 

Hey

The Deco M4 is an older device now and wouldnt have all the features that the X55 would

However.. if you are looking to use NordVPN on the xbox, this wont require any changes on the router to work.  If its just on the xbox then the router should just pass it through regardless. 

you only need to consider a VPN on the router IF the router itself is going to be using or serving the VPN