I have been running this one for about 2 years:
https://www.amazon.com/dp/B076HFCW4R?tag=fooddehydratorblog-20While the name suggest "commercial" I'm not sure it actually is (or what you even mean when you say that term), but, it works great!
It beats the chit out of the round-tray-stack plastic crap I ran forever, for sure. The heat comes from the back so all racks get heat evenly - minimal rotating and swapping places with trays. I can dehydrate 2 massive eye of rounds worth of jerky in ~8 hours, with minimal supervision.