Voltage Regulators/Surge Protectors

I only use voltage regulators (offer some surge protection as well), however they only function if you have a properly grounded receptacle.

That "properly grounded receptacle" is the absolute key to all things electrical here in Mexico. Do not assume that ANY three pronged receptacle is automatically grounded.
You can easily check for yourself with a surge protector that has lights which show "protected" and "ground fault". Just plug it into the outlet and, if the ground is missing, the protected light doesn't light up. Koblenz has surge protectors that do this.
The electricity doesn't go off nearly as frequently as it used to but it can and does often when you are not at home or in the middle of the night. It is the start up surge which can damage sensitive electronics.
That's why I use BOTH. A voltage regulator which is plugged into a properly grounded outlet and then a surge protector plugged into the voltage regulator. All the sensitive electronics are then plugged into the surge protector.
Have never lost any equipment in twenty five years of living in Mexico. YMMV.

https://m.media-amazon.com/images/I/31mkaBKIdkL._AC_SY1000_.jpg

How to check your receptacles.