What you probably mean is the following:

http://www.robbshop.nl/about-z-wave/z-w ... ve-modules

I'm planning to do the same so I Can remove my excisting "hotelschakeling".

I do not have this setup but did read about the serial port on the PI3 header not being compatible with the PI2. Something about remapping the port and the new bluetooth module. Do a search and you will find more info. Example https://openenergymonitor.org/emon/node/12311 I've experienced the same ...