Here is the official answer from TP-Link:
Q: Can there be multiple Powerline networks on the same circuit at the same time?
A: Yes, the Powerline networks can be separated by different network names. However, the total throughput is shared between the multiple networks. Please refer to FAQ 1617 to change the names of the powerline networks.
You can find more answers at the following link:
https://www.tp-link.com/de...
Hope this helps you.
Greetings from Bern