All of the Apple silicon Mac’s are so efficient I wouldn’t worry about heat unless it’s the M3 max and you plan on fully loading the system at all times.
At work we have an army of M* machines and the 14 and 16” ones have no issues staying cool and performing well at all times.
Mac OS has has this nailed down basically perfectly for over 10 years now, even windows has been great in the last 5+ years. Not having scaling done right in the age of 4k displays being cheap is a sin.