Sometimes safety is more of a concern than gain.

They tend to study a lot and would be public safety aware (although I have some who would like to get the virus so they can just not have to worry about it; stupid happens everywhere).  

Can you make a more lenient pet policy or something to set yourself apart? 

Many other CEOs would cut more and sooner.I am no fan of Airbnb at all, and I believe the days of the CEO as CEO are counted, not because of this but because of being unable to handle the crisis, especially with the breach of agreement with the hosts and deciding unilaterally to refund cancellations despite policies clearly defined.

I used to charge a daily late fee and my policy was that the late fee was charged every day, including the day rent is paid.However, this kind of policy is confusing.

If you're unwilling to comply with my policy, then I'm sorry to say you won't be able to rent from me."

If going the conventional several mortgages route, what are other safety measures to minimize risk besides a good insurance policy? 

And LL policies are one of em.

Most of my properties are in a corporation and I carry extra insurance as well as an umbrella policy, however if that was penetrated I want my retirement funds to be secure.

You could wait for a while if you are in no rush to sell --- historically you needed to wait at least 21 years for a title underwriter to write a policy for such properties.