So this reason I rented the unit.

My wife has 2 rental units and I have one rental unit, each rental unit is in their own LLC.

I would look at the DSCR loan as the first option.By the way, I suspect you are going to be disappointed by any refi appraisals   ADUs typically appraise poorly   JADUs can lower the property value Vs having the space as part of the primary unit.  

I like both of your ideas so I would look for the single where an ADU is permitted or one with a dump ADU to renovate (that's best) and balance that against the purchase of a 2-4 unit.

@John Lasheri agree with you, you'd be surprised at how many people listen to Grant Cardone though, and decide that they're going to go buy a 100 unit with 'OPM' as their first deal and quit their job.i think buying something of that size with a few partners is a perfectly good goal. 

She wants to learn if it's possible to flip in the United States, remotely, and what that would look like.

I currently own 30 units and we do about $15M a year.

.🔥 Why Co-Living & House Hacking Work So Well Together✅ Higher Rental Income Per Unit – Renting by the room typically beats traditional rental rates.✅ Lower Vacancy Risk – Losing one tenant doesn’t mean losing all your cash flow.✅ More Affordable for Renters – Competitive pricing attracts a steady stream of demand.✅ Built-In Community = Lower Turnover – Tenants stay longer when they feel connected.✅ Allows You to House Hack a Single-Family Home – No need to compete for pricey duplexes and triplexes!

Lastly, check any shared doors or gaps and add door sweeps or weatherstripping to block sound from traveling between the units. 

In Dayton, I find most of my clients like A/B class 1-4 units because they can actually cash flow AND be in great areas.