All depends on your motivations for doing keto & your goals.
Dropping and keeping your carbs below 20g and your body will produce lots of ketones for free. No need to take them orally.
Keto Base Exogenous Ketone Supplement is like getting a taxi to the end of a marathon and spraying yourself with sweat! Its adjusting your diet to naturally produce ketones that is key to the ketogenic diet.
Also if you monitor your ketone levels you will not be able to tell if you are eating correctly to produce ketones.