I am planning to extend my router range in an industrial area. Currently there is another factory in between my two factories similar to the below picture (the middle space replaced by another house). There are quite some interference as my 2nd factory only receives -70 to -80rssi across 60ft distance and unstable wifi.

I would like to connect a CPE220 (wifi camera only works on 2.4ghz) using lan cable from the router. Then, a second CPE220 at the 2nd factory. Since the CPE only supports 2.4ghz, should I just get a EAP for 2.4ghz only or dual bands? The EAP will be outdoors but under a roof in shaded area.  ** or can I just use my spare AC router, taking the EAP's job?

For the CPE, do they require DC power? What cable are required for the 2nd factory? Will the second CPE220 be linked via a lan cable to the EAP via POE? I would also like to use the same SSID for both EAP and router so I dont have to reset my wifi camera.