I've got an HP mini with an i5-9500 and no issues with overheating - it spins up the fans and throttles itself when it needs to. 6 years old and still going strong. I've also got three Mac Mini's which are slightly bigger, also no problems - the oldest one is 15 years old now, and another has a quad core i7 in it.

Like others said, as long as it's not some homebrew affair, you can assume the engineers knew what they were doing.

Which is another way of saying - don't look at my gaming computer as an example....

I work here