One might be able to find a way to inquire about tenants' financial stability. Tough policies, without intent to follow-through seems a little like bullying/extortion.
Finding a way to work with tenants seems like an opportunity for a win-win. Deferring partial rent payments should see some uptake among those who will find work when the country finds a way to right the ship.
If you have good tenants whom you want to keep, keeping them may take work and discounts. I have colleagues who are working/schooling from home who have opted not to renew their expensive urban leases for the coming year. I suspect they would have renewed at a temporarily-discounted rate.