Mains Power Adapters ?
Mains Power Adapters ?
I will treat you as discussing gadgets that transmit ethernet via power lines, which isn't really in the right place.
If you connect two pairs of devices together, they can interfere with each other.
It all comes down to your goals. You can integrate powerline devices into the main network and ensure they communicate without conflict by adjusting their encryption keys so they match.
The user guide usually provides instructions for this on most models.
If you want separate networks, there’s no straightforward method using just powerline equipment.
Running them together is similar to using Wi-Fi on the same frequency as your neighbors.