I just did the same thing with our home. We installed 2 of the 6000W heaters. It has to be wired with 240v and each one of the elements needs it's own heavy duty switch. This is what I used.
Aeotec Heavy Duty Smart Switch, Z-Wave Plus controller, 40 amps https://smile.amazon.com/gp/product/B00MBIRF5W/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Again, you'll need one per element, or two per fixture (depending on the size you purchased). These are easily controlled by my Vera z-wave controller and then assigned as a relay to the Heater Driver in Control4. This way it doesn't look like a "light bulb" and gets put into the Comfort Menu.