I'm generally suspicious that these do much of anything, honestly, but I have no data to back that claim up.
The things that I focus on with my laptop is making sure the vents are clear of dust and to go with that, making sure the laptop has adequate breathing room, meaning, don't put it on a soft surface like your bed where it depresses into the comforter and chokes out the intake vent. Make sure the machine can breathe by not covering that intake or the exhaust port.
Assuming it's properly engineered, it shouldn't have any issues cooling itself. You can also apply new thermal paste; I was able to take my temps down pretty dramatically on my old laptop with GPU, enough to the point that I could get a solid overclock. With the same thermal paste (Thermal Grizzly Kryonaut), I saw anywhere from 10-15* reduction on my Steam Deck.