I’d free feed then, most likely. I have had multiple dogs before and free fed. Never had an issue other than sometimes you introduce a new puppy to it and that first day or two they overeat before realizing hey this stuff is always here.
This current dog, I told the vet she did that and he just shrugged and said some prefer to eat small amounts throughout the day rather than the twice a day I was adjusting to after three times a day.