And, if they had issues in the far past, it can still be a red flag too.

That's not the issue.

These include accidents (I recently had 2 units destroyed by fire), natural disasters (I have had two units each hit by 2 hurricanes), property management turn over (they sell or stop being as good, I have experienced both), or turn over of team (I am turning over at handyman and I suspect plumber), or just wear n tear of property (slab leak in poor location, sewer pipes rotted out (one unit this month), roof, foundation issue, etc.).  

Not sure what the issue is there. 

If you want to get the most out of your new Pro membership, add a photo, a bio, and some information in your profile so people know they are communicating with a real person.

It's a lot easier  logistics wise and the realtor will also probably have better communication with them since it probably wouldn't be their first deal together

Neither unit has paid rent and has blocked us from communications.

You have a personal issue- car engine blows up, so you tell your tenant that they need to pay double the rent for one month so that you can get your car fixed?

There's a good chance the issue(s) you face has already been discussed and answered.Ask questions in the appropriate forum.

I think the issue is going to be more on BP side of how do you collect and monitor this, and is it really worth it, or do you just ban someone for a month for first offense, 3 months for second and lifetime for 3rd...