If you want to use the same port as the old one, you need to remove the VLAN 600 tagging in router settings. New box is using Internet, no more special IPTV port. Alternatively, follow jusbella's advice above.

Will compete with Internet download. So far for years I used a router with good QoS and download does not affect Netflix, YouTube, Unifi TV or other streaming. When I do download or speedtest while streaming video, the download or speedtest speed will drop and give way to the streaming when it loads the next chunk of content. If not using router with good QoS then I guess the video quality will drop or playback will lag when downloading, unless TM have some QoS somewhere.

Best you do so........however hereby lies the issue, if you enable QOS, you will break NAT Acceleration.......

So you must pick.....you want bandwidth or latency?

Note: Above doesn't apply for native IPv6.