Let's say the deal is $100K for 10-20% of pre-revenue/pre-product pre-Mittelstands.
You will get 100+ out of 200 businesses that are >1X+, 20+ that are 10X+, and 2+ that are 100x+.
So I'd do diligence like YC - wide open applications, largely focused on the team, one or two interviews max, global focus.