i run several mass-market consumer model laptops with the lid closed. as long as the vents aren’t obstructed, not a problem here. mine are all lower-wattage soc with integrated gpu, though; the most demanding one that’s on 24/7 is still only ~ 15w cpu at 100% load, and it never runs at that; it rarely even throttles up from the 800mhz it idles at. i stand them on end so the vents are clear, and use some lego to enforce spacing between ‘em.