Moreover, short term rentals in Mexico is often unrestricted while it is often illegal or very restricted in the most profitable places in the US.So maybe you could sell one or both properties in Monterrey and use the money to purchase short term rentals in places like the Riviera Maya (Tulum, Playa del Carmen).

There is definitely loans available in the 9 to 10% range, but you may have lower LTV and be putting more money down, like 20% instead of 10%If you are borrowing for rehabs make sure you ask about draw process, fees, restrictions on changing plans, draw schedule, time to process it etc.As you shop don't just look at rates ask how quickly they can close, if they have discounts for repeat clients, in house appraisal or 3rd party.

A rehab loan from a conventional lender will also come with various restrictions.

Seperate Water meters for each unitInstallation of low flow faucets and toilets by licensed plumberCertification with the local health boardObligation must be in the leaseCan only be imposed at the beginning of the lease

They can limit or restrict rentals. 

In my experience, creatively financing your personal residence is difficult because your options are really restricted. 

restriction on breeds

HUD tracks by social security number for owner occupants and you can only buy once every 2 years as an owner occupantWhile you sign a document stating that you will occupy for one year, there is very little, more like no enforcement other than that 1 every 2 year restriction. 

SDIRA is bit complicated and restrictive ...someday may want to sell my house and live in one.

The Graham Leach Bliley act restricts access to drivers license numbers and social security numbers.