We happen to have a how to guide for getting started with that system here.
In short you would need an unregistered LTE Alarm.com communicator and purchase service on our website.
The Pulse Gateway and ADT cell would be removed. The Alarm.com module would then connect to the BUS.
Based on your description of interests, your best bet would be the Surety Alarm service plan. However keep in mind all service is month to month and you can adjust your plan at any time, 24/7, on our website, so no need to agonize over the plan choice up front.