There are many reasons why people need or want to sell their home for a discount, other than forclosure.

It would seem you would at least need to factor some discount into your numbers to offset the risk.I recognize this may be my own inexperience but I do try to avoid things that alienate a portion of my potential buyers. 

A competent mortgage broker will likely know what the current rules are.So, buying a group of units for a discount might not be much of a discount at all.

Unless you do a fantastic job of self-servicing, most note buyers will expect a deeper discount for a self-serviced note.

You present them with deeply discounted properties.

I have a connection for a commercial service for my offices that gets me a discount (sort of) -- you may want to talk to some people and build a relationship.

My question is whether there is a way to discount the value of the property based on the m2m tenants and additional risk of not having long-term leases secured?

At that point, it's possible the lender would agree to a discounted payoff to avoid the time and expense of foreclosure.

Do they pay higher premiums and aren't able to leverage multiple property discounts?

Not sure if the discounted purchase price is enough to make up for lessor rental rates but my firsthand knowledge up there is two years old at this point so you might want to confirm with your own due diligence.