Question about TP-Link TL-WPA7517 KIT

Here is the answer from our responsible department :

You can find information in the user guide : https://static.tp-link.com/2020...
To expand your existing wireless network (page 8).

You can confirm that the customer can extend the coverage by adding more expanders.
The best option would be to purchase the same expander model (as a set).

Unfortunately, we only offer it as a kit.