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Just raising it helps some, but in general any newer laptop draws air from below and exhausts it from the sides so a cooler on the bottom doesn’t do a lot for the laptop.
The exception is if you are resting it on a soft surface that could block vents, like your f-ing lap! In that case any of those coolers will make a big difference in both your comfort and the laptop. On a good hard surface that will make very little difference unless your laptop vents are clogged up as others have said.
True, but sadly that headset is $60 at Amazon right now versus 80-95 everywhere else based on a quick search.