Superior filters would already be inside a laptop supply. Surge protectors ignore any voltage typically less than 330 volts (see its box for your number). Noise would be tens of volts or less. Clearly a surge protector would ignore (do nothing for) this anomaly.
So why is noise getting through best filters already inside a laptop supply? What other wires are incoming to that laptop? Are USB devices power externally? Does the laptop have a network cable? Start by listing all possible noise paths.
Obtain a cheater adaptor. It permits three prong appliances to connect to two prong receptacles. Use this to temporarily disconnect the safety ground wire. To learn if noise changes or is eliminated. This is not a solution. This is only step one: identify the problem. Solutions come later.
Safety ground wire completely bypassess filters in the laptop supply, filters in that Amazon.com solution, and filters in the Surgex, Brickwall, and Zerosurge products. Before spending money on a solution, first determine the incoming and the outgoing path of that noise current. A temporary disconnect of that safety ground might identify one of those two paths. Solution occurs after identifying the incoming and outgoing noise paths. Therefore even incoming wire to the audio system must be listed. Example, AC has a black wire, a white wire, and a green wire. Every wire must be defined to identify potential reasons for that noise.
