Can you actually find an Ethernet over power line adapter that delivers 1Gbps? From my experience you only get like a third of the advertised bandwidth.
The apartment was completely rewired in 2015.
This blogger has some great examples: https://specklepattern.wordpress.com/2018/03/03/seven-genera...
The "2 gigabit" adapters top out at 470mbit when both sides are plugged into the same duplex receptacle. That number is cut in half when you move to another room, and it gets worse from there.
Every Powerline vendor, without exception, are using funny math when coming up with their advertised throughput numbers. In no situation will they ever be able to provide 50% of their stated throughput, and more typically it's closer to 10%.
They probably hit 2 gbps for 30ms on the same duplex with zero interference.
If your tests show > 1gbit of throughput on a device which has a 1gbit port, something isn't adding up.
You can see the link speed between the nodes in the TPlink app.
They also support LAG, I have two of the 3 ports LAGed to a Switch.
From what I can tell the biggest issue with these other than the wiring/noise issues is if people rely on them as a switch.
I used to have 3 devices connected to them (AP, TV and Xbox) switching to LAG and a proper 1gbe TPlink switch that ironically costs more than the homeplug more or less solved my issues but ymmv.
I also think that the UK residential power wiring that uses ring circuits might be better for homeplug usecases than other curicut types.
If you have time, could you run iperf3 (brew/apt install iperf3) between two computers separated by the powerline devices?