Yup. I'm currently looking to raise 30% of my deal (~$2mm). Structure will be something along these lines: 20 units at $100k each (max 2 or 4 units per family). Coupon will be 5% annually of whatever capital hasn't been repaid yet. Once the pref shares have been repurchased, the owners would retain 20% total common equity (or 1% common equity per unit).
No particular plan to repurchase the common equity, but it's straightforward enough to offer tenders annually to buy out anyone who wants liquidity and at 20% max outside ownership (4% max per family), the investors are never going to encumber you even if they hold on forever, which I understand that most don't.

A percent of revenue share across a period of time with a holiday as you ramp up. Most cases, you can refinance to buy out investors or negotiate buy out options over some timed intervals. The simple math is to base your calculations based her total versus per business unit therefore you minimize your downside and of course your upside. You wouldn’t want to me in a situation where you are paying off an investor with a bolt on that is losing money. Bottom line, you have plenty of options and numerous ways to structure the deal.