Before deciding on a router you might want to check the network hardware section of the xbox.com forums.
The vast majority of routers especially older models do not have multi console support. A router needs near perfect UPnP support to allow you to get an open NAT on two or more consoles. I cant post a link currently because i'm posting this using the web browser on my xbox one and there is no copy and paste.
Also as you own multiple xbox ones you might want to avoid TP LINK routers. Looked on xbox forums. Although I cant find the model numbers listed earlier I've looked at some other model numbers and none of them have multi console support.