Assuming you are lacking a common and need to add one. But to be certain I would contact the manufacturer of the thermostat as I have no experience with that one.
Didn’t work and burned the component
This works only for one thermostat, so if you have 3 thermostats, you need 3 Common Makers.
This product has not been certified by Underwriters Laboratories. I called fast stat to ask. They indicated there intention was to seek certification from that company but at this point they had not requested it.