that incorporates a router, so no need for anything additional.. you just need to get it set up right.. there's a specific sequence to get modem mode up and running..
Log into the hub on http://192.168.0.1 and select the option to put the hub into modem mode
The hub will then reboot and come back up in modem mode - give it five minutes to settle down
Disconnect all ethernet cables from the hub
Power off the Hub and your router/mesh system
Connect your router/mesh system to the hub via ethernet cable and switch it on - leave it five minutes to settle down
Power on the hub and leave it five minutes to settle down
Should all be working.