Unfortunately both of my previous two lacked even an email address. My job has a contact email for employment verification and I had to get a special phone number from HR for my landlord because they didn't use email. This company probably has two dozen properties around town (each with multiple units) and doesn't even have email. Sometimes its amazing when we step out of our tech field and see how normal people live and work.
That being said - if you could convince landlords to give you 20 minutes for a demo, I bet you could sell a lot of them on it. You would probably need a sales team for that though.