I can answer both of these questions more authentically and easier when I have more context on your specific goals and life situation.

They may try to say it's an ESA and skirt around it and good luck getting them to provide any authentic documentation for it.

Don't use scripts -- I respectfully disagree with the above -- people want authenticity.

See here: FCC to require phone carriers to authenticate calls by 2021If you use something like Callrail for tracking purposes and use their numbers for cold calling they are now showing up as "Spam Risk" on caller ID which has dropped the contact rate significantly.

You can no longer even use the desktop version offline since they require online login to authenticate access.   

Utilize Two-Factor Authentication : If you use your own website, you can have your IT professional help you set up an algorithm to create a 'blocklist' that allows you to see if a someone is attempting to book a self showings in multiple areas at one time.

I understand the process takes a bit longer and is not as scalable, but is there a potential benefit regarding authenticity to the owner/reader? 

My favorite part of BP is that the community is extremely genuine, authentic, and always willing to provide a helping hand.

Authentic Title Servs., Inc v.

I'm making a post here in an effort to understand how landlords are currently verifying the authenticity of tenant submitted bank statements, pay stubs, offer letters, and references?