Cook grain-free meatballs in a crockpot (if saving for later, freeze meatballs until ready to use). Put a layer of marinara down first in the crockpot. Add a layer of meatballs. Layer cauliflower on top of meatballs. Pour more sauce over the cauliflower, leaving some to pour over pasta when it's completed. Place on low for 6 hours, then serve!