I don’t currently have air quality measurements, but I do have Aqara (not Wifi but Zigbee) temperature and humidity sensors. Zigbee uses less energy (afaik?) than WiFi or BT, and additionally, while there is no arrow, the symbol shows you which way is up, and it fits with the description (ventilation holes at the top).

From what I’m reading, the fact that several sensors measure almost exactly the same values when mounted next to each other, is actually a good sign, correct?