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The ratios are the same, you just can’t find videos of people doing it with small things because that’s not as interesting. There is still ultimately a limit to how much a given amount of heat sink can transfer heat to air even with a small processor.
20w TDP would be possible with some extra forced air from a dock. Mainly because some handhelds can be put to 20 tdp, and they technically work although they hit thermal throttling at 90c almost immediately. With a little bit of forced air from a dock you should be able to bring that down to a much more reasonable 80c
This, I have been using it for many many years. I wouldn’t call it perfect but it’s better than the other options in my opinion