Your model is WA850RE or WA854RE indeed? Try to download the latest firmware for the right model. http://www.tplink.com/en/download/TL-WA850RE_V1.html#Firmware After download it, unzip it and try to...

This hotspot is open (no wep/wpa) but redirects you to a login page , where they validate you are a customer. I'm afraid that MR3220 doesn't support such kinds of authentication in WDS mode.

You cannot change IP address of your NVR/Cameras to 192.168.0.* range? IP address obtained in 3G/4G section depends on your ISP. Maybe they can update on their side.

Do you know PA4010's LAN port is not gigabit port? It is impossible to get 240Mbps. Obviously, now you need powerline devices with gigabit port instead of 10/100Mbps port....

Model is TL-WPA281? What's the firmware version of it? You may need to upgrade the beta firmware to support Airplay and Airprint. Subnet a ticket to ask for it....

You printer is not in compatibility list of W8980, right? When the printer is connected directly to your PC, can you print? http://www.tp-link.com/common/compatible/print-server/