@Nidel47 

HI, thanks for posting question here.

Do you have TP-Link powerline device already? Sorry that I can understand what is cpl600.

Usually, we strongly recommend using the same serious of powerline devices in one circuit/network, for example, if you already own a set of TP-WPA8631P KIT, it would be better to add TL-(W)PA8xxx devices as well. Using different series of powerline devices in one network might result in performance degradation.

    3. We do not recommend using TP-Link powerline devices with other brands in one circuit/network, there might be some serious compatibility problems.

    4. To find out how many powerline devices can be added to the same network, please click this link.

Also, you may refer this article for more details.