@HalfOrc 

What is the model number of your powerline adapter? What about their actual performance? Including stability and speed? 

We can add another powerline adapter to boost the wifi signal or provide LAN ports, but it is hard to guarantee its performance, cause it is more related to the actual network environment. 

If the current connection is weak, you can add an additional adapter and please verify the warranty policy in advance, if it does not work well as expected, you can return it. 

Good day.