I am lazy, for the rest look at my post here
If you have an aluminum bottom you need to figure out how far the bottom lid is from the copper cooling plate (often painted black).
If it is less than 1 mm than you can use the blue 1mm silicone heat transfer pad. it should have the size of your cooling pad because it is not a very good heat transfer method.
The normal material used to make the metal laptops is not pure aluminum, that is too soft. So it will be an alloy what will not have the same heat transfer properties of pure aluminum.
To get the best heat transfer, you have to test yourself what works best with you computer.
Try to beat 15 Watt from a 6 Watt Apollo Lake
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1981 soldered my first Sinclair computer 1K, tapedeck * 1984 build and sold IBM clones 8Mhz, 512K, 20MB HDD * 2018 messing with ultrabooks