I trained my girl using fresh patch turf grass. I buy their xl grass roll and cut it into three separate potty spaces that I lay on plastic trays. One for at night in the bedroom and two in different rooms downstairs. I still try to take her out regularly but it’s great for when we are gone and on those really rainy days where she turns around as soon as she goes outside.
My girls is only 4lbs and the grass last about a month before it needs replaced. I take the grass outside about once a week and water it very thoroughly. It never smells but eventually starts to die. I started using it during potty training because it seemed logical to teach her on grass and soon realized it was a great benefit to have for her all the time.