Multiply switch locations (3) what dimmer will work

Hello I am new to Smart Things. I have 8 LED kitchen lights I would like to control via smart things and would like to use a hard wired dimmer switch. I have tried 2 different switches the casita wireless switch which does not work with smart things and the Leviton dimmer switch R02-DZMX1-1LZ. I could not get the Leviton switch to operate my system maybe additional products are needed.

Any recommendations on the best option to accomplish this project. Please help.