You can use a doorbell with the Surety Home plan. You would need to have the Surety Doorbell Only Video add-on, which would add $3/month to your subscription price.
Available plans and pricing can be found here. Changes to your current plan and add-ons can be made using the System Manager section of your Surety account.
Once you have that added to your plan, steps to add a Skybell video doorbell to your Alarm.com account can be found in this guide: