Why both of them and do you prefer one over the other? 

I prefer a single basin from a maintenance perspective and typically always use this in rentals.  

I’d prefer to avoid double-paying for insurance if possible.Additional Note: This property will be used as a short-term rental, which adds to the complexity.Any advice on how to structure the insurance to cover all bases without redundant costs would be greatly appreciated!

Unless you live in area that has many ADUs already built that have been sold with the home or as individual parcels.

Those people overlooking what it means to “materially participate”Here’s the Material Participation Criteria:Spend more than 500 hours on the short-term rental businessDo substantially everything for the STR businessSpend more than 100 hours on the activity and no one other individual spends more time than you doSignificant participation activity for more than 100 hours, and your combined activity in all significant participation activities exceeds 500 hoursParticipating in the business for five of the 10 previous taxable yearsPersonal service activity (non income-producing) for three of the previous taxable yearsRegular, continuous, provable participation in the business for more than 100 hoursA Cautionary Tale: The Story of JacksonLet's take a moment to learn from the mistakes of others.

I've set this up for some of my employees who prefer gmail.

If your goal is to get the info asap for small multis, I would go with something where it's already skip traced so you can direct market or call for that investor's preference.

But when it comes to noise clauses, do you prefer to start with a 3-day notice?

That said, I prefer to use a HELOC for short term investments like fix & flips because I only pay for what I use and I can continually keep recycling the money.

This seems more of a preference item on reporting, but I wanted to get more insight on how these transactions are structured.