You can ask Tiks neighbour Ricardas (from Lithuania) from https://ipthermometer.eu/ if they want to expand their devices. They are open to new ideas as we wrote to them. We use these devices a lot, great stuff in combination with Zabbix or PRTG, and not rack-vendor-dependant.
I think I'll use something like this to turn on the fan.https://www.aliexpress.com/item/1005008980226732.html
It's all up to us
The limit of that one (or of any other wi-fi IOT device, possibly ESP32 based) is that it is wi-fi.
A cabled connection is (IMHO) extremely more reliable, particularly if you are going to put the thingy in a rack (please read as in a place where wi-fi signals will likely be very low), but more generally if it is something you need to rely on for the safety of the devices you cannot afford that it decides to disconnect from the wi-fi on a whim.
Manufacturing does not happen in Riga, and has nothing to do with developers. As you know, global electronics supply market is in complete chaos right now.