Happy to help. Is this regarding a current Surety subscription? Or do you have service through another provider?
11 on the signal strength is not a bad number. That will work just fine. Anything double digits is good to see. If you are having issues, the more telling stat with regard to the signal quality is the Registration Time, which is something your service provider can look at on your account. That is what I would check first to determine the connection quality overall.
Q1 should i get a signal amplifier?
No. There would be no need based solely on what you’ve described.
Q2 how often does panel test its signal to Alarm.com so i could know if there was a problem.
Panel communication is supervised by Alarm.com, not the panel. Outbound panel tests are often monthly.
Alarm.com pings the panel on a supervision interval to make sure it is still signaling. The supervision interval can be anywhere from 24 hours to 1 hour, depending on your account. That would be something your current service provider would be able to answer. (I’m not seeing a connected subscription, let me know if you have service with us through another username.)