Do you have any models to recommend? Especially some that could last in harsh environments (dust, high temperature, insects, ...).
That depends on a lot of variables: what kind of IOs you are looking for? Do you need them isolated (DIO vs GPIO), Does it need DIN rail? Integrated screen? What connectivity is needed (wifi, cellular)? Or resources (ram, cpu, etc.)? What’s the power delivery requirements?
So there’s a lot of factors that only you can answer given you know the application, but since you are looking for dust proof, then you should look for fanless AND ventless one, and one that’s vibration resistant (obviously with an SSD), and most of them can survive high temperatures, but personally I would even add it in a panel to provide extra protection, with a fan and proper ventilation just in case.
I did try some of them, like onlogic (1) and arestech (2) among others, and don’t restrict yourself to the brands, some Chinese (mostly cheaper) ones are good enough for the job like GigaIPC (3) and others too.
(1) https://www.onlogic.com/pub/media/resources/Brochures/LogicS...
(2) https://www.arestech.com.tw
(3) https://www.gigaipc.com/en/index.php?action=products2&cid=2&...