Hi,
I have installed OpenWrt with ddserver on several TP-Link TL-WR902AC AC750 v.3.
The device has a good WiFi range (over 40 m in my experience, even more if you are in the US

).
If you are on Windows I recommend using Tftpd32 for the first install, because you can't install an OpenWrt image on the original firmware. It looks for a special signature, I guess. You have to do the first install via ftpd.
You can find a link to my how-to
here.