Either a guard on the ground or some kind of high-tech electronic security.

They've stated all furnishings, bedding, electronics and daily use items must be removed and relocated into one of the habitable areas.

When those meetups are not happening in person, they are morphing to online meetups, via Facebook groups, Zoom meetings and other electronic venues.

For 9.99 per month all my tenants can pay electronically for free and they have an instant payment option also included at no charge. 

Showings on vacant properties only with electronic lockboxes , so no contact needed.

For electronic lock boxes go self showings, are you comfortable that people might not steal something?

I haven't forced them to use Cozy but provided them the option with the benefits of:-accepts split payments for easy in budgeting-builds credit for future car or home purchases-no driving to the post office or paying for stamps-electronic receipts-can setup Auto transfer so you don't need to worry about it-no fee-accepts credit card payments for challenging times (like now)

(It can happen with other forms of electronic payments but seems to be easier to do with credit cards.)Here's one of the prior posts talking about it: https://www.biggerpockets.com/forums/52/topics/672783-fraudulent-transactions-on-rent-collection

Contracts are handled electronically as they have for years.

@Michael Fitts Letting perspective renters view a home via electronic entry is a recipe for disaster unless it is a typical MLS showing where they are accompanied by a licensed agent.