I'm Running Surface Pro 7 - USB-C hub that connects external monitor. i dont really have an issue with temp. however maybe run Task Manager to see if anything in particular is running high?
When you run it and dont see anything too weird, try loking at "more Details" section at the bottom left of that screen and going to "Startup" and see if anything is enabled that shouldnt be. that might help keep it down. lastly i assume you arent using cases with the tablets?
Well I would if I could get past all the setup when you initially turn it on but I cant even get past that so idk what to do and my first post I had a typo It has a 10th gen i5