What Ernie said about the 12volt wall wart. If the alarm.com panel is able to accept a 12volt (DC and/or AC). Then use that directly. This is so you'll be able to leave a failure point, the relay, out of the equation.

If you have no choice but to use a relay with a wall wart. Get an automotive relay, especially the modern ones. As they are designed to last. I have an 11 year old car with original relays. Some of them are active as soon as I turn the key and for the duration of the drive... 160,000 and 11 years is a long time and mileage.

KOT