I think it depends on how much overall weight you want to lose. I want to lose 6 kilos so mine suggests 13 net carbs. However when I started (a month ago), I set the macro sliders to 20 net carbs as I wanted to cut my carbs down week by week.
I’ve been adjusting my ratios every so often as needed. I think I’ve found a good balance for myself since starting keto about two weeks ago, and am still losing weight. There are other calculators on the web to try too. We are all unique and require our own formulas - IMHO.