Oh, so you're talking about the speed the adapter tells you. In my experience those speeds are about 2x what you'd get in reality over a TCP connection (using something like iperf3).
If you have time, could you run iperf3 (brew/apt install iperf3) between two computers separated by the powerline devices?
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.