I named identically 5GHz SSID on my router. Will it roam automatically?
I have a setup with both 2.4 and 5GHz radios sharing the same SSID on two openwrt routes (or - more correctly - access points).
Does it roam? Yes.
Do I see my phone often on 5GHz? No.
Basically the only times I see connection on 5 GHz is when I go downstairs and my phone switches to the AP down there - with nothing in between.
So - it works. Probably no as well as it might but currently I don't need more.