greetings. my home office is upstairs in the attic. when someone comes to the door and either rings the doorbell or knocks on the door, i can't hear them. they can yell, scream, and pound on the door all they want, i can't hear them. i have had three electricians come and look at the existing doorbell system and all three said it cannot be extended or added to. i am wanting your opinion on something like the ring.com system. do those types of devices really work? it would nice to hear and see who is at the door. the distance from my wifi router the the front door is probably less than thirty feet. thanks