I've got a cheap laptop stand with built-in fans that blow against the bottom case of my MBA. With my previous M1 and current M3 the stand keeps them from thermal throttling for longer periods. Most of the time it's completely unnecessary but I use it occasionally when doing long duration compiles or other long term heavy loads. Even without using the stand the tasks would complete in a reasonable amount of time, it just gives me a few extra minutes of "full blast" which is often all I need.