Asus AiMesh setup/config question

Spec wise I think both routers are identical. one is dual-band (ac88U) and the other is tri-band (ac5300).
I keep reading about backhaul (I would assume this is main node & slave node communication) & dedicating one of the tri-band 5Gs for this task, but I'm not sure as to if it's possible with the dual+tri AiMesh config. Or what roles to assign each of the routers to make it work.
 
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