I've tried the MHCOZY today. It was a direct success. Just plug and play. 
Edit:
For readers later on; In my case, the regular door buzzer stopped working, as soon as I connected the MHCOZY, for what ever reason. To keep the regular door buzzer-function, a used the manual switch, which is connected to the relay. I put everything into a box and squished a plastic button over the switch to access it.
The MHCOZY was set to switch mode. Within Hubitat, I quickly wrote a rule, turning the switch off, three seconds, after it was turned on. This keeps the regular buzzer function, with more than enough time to enter the building.
Using the Hubitat Dashboard from @jpage4500, I quickly created a widget on my smartphone, for a quick access (don't forget to enable cloud mode). Now I don't need a key anymore, to get into my building. 
