I had the EDIMAX running on a different device. This post details the config.
https://forum.openwrt.org/viewtopic.php?id=58548
It seemed to work at first, but later I had some speed issues. Some have reported that using a USB cable to put distance between the devices helped. I just went to a Buffalo device, which performed better, but still not as fast as the single radio correctly configured. Definitely easier to manage things with 2 radios.