I think this question is dependent upon location.

Quote from @Chris Strausbaugh: I'm located in Pennsylvania. 

This will help to reduce the premiums.Self Storage – “Company” Liability/Property insurance.Below is a summary of our Storage insurance for one location for your information.

Lack of down payment, lack of entrepreneurial personality, low tolerance for risk, looking for the magic key that fits their desires, just want to learn, sold "Castles in the sky" with a gibberish of disconnected statements that while true in a plethora of instances do not add up to truth in any one instance, fear of failure meaning not able to take a financial loss without going into poverty, never told up front how much money they will need to spend to buy the investment in addition to paying for the class.

Your ROI needs to be much higher the older you get started because of the loss of the magic of compounding. 

The real estate investing industry uses "Classes" to rank property performance risk, but there's NO agreed upon industry model:(Here's what we use for our Metro Detroit market:Recommend you first figure out the property Class you want to invest in, THEN figure out the corresponding location to invest in.Property Class will typically dictate the Class of tenant you get, which greatly IMPACTS rental income stability and property maintenance/damage by tenants.If you apply Class A assumptions to a Class B or C purchase, your expectations won’t be met and it may be a financial disaster.If you buy/renovate a property in Class D area to Class A standards, what quality of tenant will you get?

McKinney is thriving, but so are other parts of North Texas, and a broader perspective could reveal other great opportunities.Here’s what I’ve observed managing a significant number of rentals in the area:Bedrooms and Layouts:3-bed, 2-bath homes consistently attract the largest pool of tenants and have the highest occupancy rates.4-bedroom homes have grown in demand, especially with the rise of remote work, as tenants look for extra space to use as a home office.Square footage is less critical than number of beds and baths.Supply and Demand:McKinney’s growth is driving demand, but the quality of the location matters greatly.

To create rental income that enables financial freedom, you need a location that meets specific criteria.Rents increase faster than inflation: Prices and rents are driven by the imbalance between demand and supply.

Location is key.

Evaluate potential rental properties with a keen eye on location, cash flow, and potential appreciation.