This keeps it off the radar of other lenders and doesn't disrupt my other deals.

Talk to them and explain that you will group the showings to minimize the disruption and everyone will be wearing masks.

You can find many examples on Real Estate Disrupters podcast. 

I get that they're trying to be a disruptor, but those who successfully disrupt markets do so with superior products and services that are delivered through a different channel or method. 

Even when the market research is qualitative in approach, proven, established, and conventional research methods are employed.Research Creativity - Market research must be innovative and keep up with the disruptive technologies that overtake the creation and sharing of information, including market research information.Multiple Methods - Some of the strongest and most credible market research uses multiple approaches to a research problem.

Most roommates stay in their rooms or are out of the house, most of the time so it’s not even that disruptive.

With multi units the wall separating the units is usually fire rated and typically you would not be allowed to remove/disrupt that rating.

To try to help with your question - here are some points I would suggest:Transition time - the transition from previous owner to new owner occurs at closing not before so if you were my client ( I'm a Realtor) I would advise that you do your best to ensure that any disruption caused to the tenants during the transaction period be kept to a minimum - your Realtor can assist with this - request that contractors that need to work on the transaction - inspectors, termite companies, roofers etc. visit at the same time. 

Checklist...1) The federal government has mandated the Defense Production Act, which gives the government ability to tell any corporation that they now have to work for them and do what they demand. 2) The federal government is rejecting our fourth amendment to due process.3)  The government is artificially propping up particular sectors and corporations of their choosing by giving them billions of dollars. 4) The government is buying out ETF and shares to the point where the stock market doesn't even come close to matching the climate of our actual economy. 5) The government are now disrupting businesses by telling them they can't operate until they say so regardless if they can survive or not.6) The government is now telling landlords that they are forced to run a homeless shelter instead of a business for the time being.

This prohibition includes, but is not limited to, loud noises, loud music, noxious or unpleasant odors, and disruptive behavior or actions."