Always give keys to a trusted neighbor/friend and/or your maid. Have your instructions, phone numbers who need to be contacted, info about your pets, etc. in a prominent place like your refrigerator.
A few years ago there was a company called Vida Alarms here. But they didn’t have enough customers to continue. It was a “I’ve fallen and I can’t get up” business. Since I live alone I try to always have my cell phone with me just in case.
Even if you don’t live alone, having emergency contacts is important. What if both of you are in an accident, for example. Who needs to be notified?