Valuing your time and understanding your limits and skills will make a big difference in the equity you build, the quality of the work and your sanity. 

Quote from @Michael Smythe: @Jerry NoguerasRecommend 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?

@Polat CaglayanI've never seen a formula but here is a general rule of thumb for multifamily:The class of an apartment refers to the quality of the building, which can be determined by a number of factors, including age, location, and condition: Class A: These are the highest quality apartments, typically built within the last 15 years.

So an identical neighborhood (income, crime, school quality, etc.) can cost you as much as a $100k less on the South side simply because your neighbors are brown or black as opposed to white.this right here is the gem advice.  

https://www.biggerpockets.com/forums/12/topics/1122318-quality-turnkey-companies?

@Jay Fayz for SFR (1-4 family) Classifications are mostly opinion-based.Not aware of anyone tracking eviction rates, except Evictions Lab nonprofit that doesn't like landlords.Here's some info that might helpt:---------------------------------------------------------------------------------------------------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.

If you hate the process of placing tenants, it may be worth it to hire a property manager to handle tenant placement for you.I think finding a new tenant is a better long term strategy if you're confident you can find a higher quality tenant that will cause you fewer headaches.

I've heard nothing but complaints from customers AND their franchise agents reegarding the quality of their 800-number service center. 

The quality of answers to your are directly correlated to the quality of your questions asked.