Bro. Those actually quite shit networking solution. Very old gen method.

Now either go mesh network.

Or one router to multiple ap.

All still under same network. Can put under same wifi name, same band.

If can wire to every node even better stability, signal strength.

Those cheap repeater only echo the signal from the main router.

So ur wifi range maybe extended, but quality/speed really crap.

U really pay for what u get.

I have no exp with powerline solution. But the latency and range cannot be as good as typical cat6 cable.