Running lid closed with external display has been officially supported since forever so I wouldn't worry about it too much.
It is supported https://support.apple.com/en-us/102555 but thermal throttling reduces performance https://osxdaily.com/2024/04/03/using-m3-macbook-air-in-clam...
It is supported https://support.apple.com/en-us/102555 but thermal throttling reduces performance https://osxdaily.com/2024/04/03/using-m3-macbook-air-in-clam...