It does support mesh, but you need to use a wired backhaul because the Flint 2 isn’t a tri-band router.
You can technically create a wireless mesh network, but you’d be sacrificing either your 2.4GHz band or your 5GHz band. And with the state of 2.4GHz on the Flint 2 it’d currently be a horrible idea.
Anyway, here’s two videos. One guides you through setting up a mesh network and the other shows you how to enable fast roaming.
