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This one has served me well:
LapGear BamBoard Lap Desk with Phone or Tablet Holder - Natural Bamboo - Fits up to 15.6 Inch Laptops and Most Tablets - Style No. 77001 https://www.amazon.com/dp/B07HM2DY78/ref=cm_sw_r_cp_api_i_dWXdFb49DSE5H
It doesn’t have any active cooling, but the holes combined with a hard surface help a lot. You really just need to make sure it’s on a hard surface so the bottom vents aren’t blocked.
LapGear BamBoard Lap Desk with... https://www.amazon.com/dp/B07HM2DY78?ref=ppx_pop_mob_ap_share
I like it, too! A little wide for some chairs but that’s okay. It’s this one here: