Firstly, all of the Kobo WiFi devices only do 2.4GHz. If you have a 5GHz only access point, they won't see them.
Other than that, to the best of my knowledge, the Kobo devices can connect to all 11n access points. I have connected mine to a few over the years, with no real issues. I don't use OpenWRT, so I don't know about them.
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