The 3 and 4 gang units are not flashable atm with Tuyaconvert but @markus and @Hongkey determined that chip while not supported under Tuyaconvert OTA it's still flash able with a gig. You can see them talking about this further up.
No worries the 1 and 2 gang is still flash able until Tuyaconvert unless they change them out in the future as well but my guess is they have ton's of the same stock because those units have been around for some time now. You can learn how to setup and flash using Tuyaconvert here. Also given you use NodeRed you have two choices you can A) just use NodeRed nodes here or B) use @markus Hubitat Tasmota firmware and drivers here.
