I have a short Mercatus policy brief on that topic, co-authored with Trace Mitchell.  Excerpt:

Risk from reopening cannot fall to zero, but investments in safety by employers can bring real gains in many cases. Ideally, a plan should both minimize risk and encourage employers’ safety investments. In essence, policymakers should (1) limit liability in the short term to cases of recklessness, (2) use direct regulation to prohibit some obviously risky options, and (3) create and fund a COVID-19 compensation program while capping liability for covered entities.

To understand how this combination of options might work in practice, consider the simple example of the restaurant. Many states are allowing partial reopenings of restaurants, albeit with social distancing, which might comprise outdoor seating, limited seating within the restaurant, or both. Yet some practices that would be very dangerous in the current situation, such as open buffets, have been made illegal per se. This arrangement takes some of the highest-risk problems off the table, and for the better. It is also appropriate for regulation to mandate soap-and-water washing facilities for workers in all restaurants, to provide another example of a sensible regulation.

It is still necessary, however, for these businesses to have stronger liability protection, so that restaurants may proceed with greater certainty, and also solvency. While the number of future COVID-19 transmissions in restaurants is unlikely to be zero, restaurants can only do so much to limit risk, vulnerable individuals still can opt to stay away and indeed are likely to do so, and tracing particular cases to particular restaurants is very difficult. For all of those reasons, we do not expect the traditional liability system to perform well in the case of restaurants, and we wish to limit its applicability, while of course keeping other safeguards in place. In essence, our proposal takes that commonsense approach to restaurants and applies it to the economy more broadly.

I would stress that nursing homes require a fully separate treatment.  Here is a related Marc Thiessen piece.  Here is Ross Marchand on state-level experimentation with liability.