I think CPE510 is better choice than CPE210 since it works in clean 5GHz frequency. Other sides it's similar to CPE210. As for WBS510 it's a waste to use in such simple scenario. In terms of long...

In some scenarios it can be connected to an IP camera. Refer to UG of Chapter 2: http://www.tp-link.com/resources/document/CPE510_V1_UG.pdf

Since the Spectrum Analysis tool is working well, I think the unit is fine, And it's normal that at the first several seconds there are no Wi-Fi signals showed in the Survey list as a result of...

I cannot manage the module to show any WIFI signal via the Survey option at the 5GHz (a). Since you have selected the working mode of Client mode, it will not broadcast wireless radio. Use AP mode...

Yes. In both case you have only one router so all the devices are in the same LAN.

For your requirement, here are two ways: 1. Configure TL-WA7210N in Client mode, then wired connect an extra AP(TL-WA701/801/901ND) to the LAN port of TL-WA7210N. 2. Configure TL-WA7210N in...