Please do refer to the manual on the correct powerline kit to use to connect directly to the Router.
There should be one main powerline kit that connect to the Router via lan cable.
And the powerline kit should be connected directly onto the wall power point.
For the other secondary powerline kit which is connected directly onto the wall power point.
The lan cable will be connected between the powerline kit to the computer.
For Speedtest, refer to this link; -> Starhub Local Speedtest
i am not starhub staff &or related to.