I originally thought about doing Airbnb, but now I am considering mid-term and even long-term.

It's absolutely is possible to find a cash flow positive property out of state, even in the current market.

We learned that even minimal investment, such as cleaning the mobile home and handling overgrown landscaping, can significantly boost the property's value.

Just Breaking EvenWhile breaking even is better than a loss, it's generally not ideal.I would aim for properties that provide positive cash flow immediately to ensure you're making a profit after all expenses.

What I’m wondering is—even though they’re allowed in unincorporated miami dade county—if folks who have applied for licenses in this county are getting obstacles thrown at them preventing them from getting licenses.

Sue them (good luck, even if you win, will they have any assets to attached). 

However, most commercial mortgages offered by community banks still demand interest rates of 6.75 - 7.50%, and hard money/ debt funds demand even higher rates. 

Some Canadian banks have international lending divisions that may be able to assist you in obtaining financing for US properties.

even in lower cost markets.https://www.biggerpockets.com/forums/12/topics/1171104-the-m...and - i still think it's better to pick a market that you have a connection to rather than one that meets arbitrary numerical criteria. 

They will do it for even 50