So far, my spidey senses haven't gone off. 

After 45 + years as a real estate investor, broker, lender, fund manager and syndicator, I’ve become aware that the “dream” of many investors and investor “hopefuls” is to be able to generate enough cash flow to live off their real estate holdings and accumulate enough wealth to make “work” optional.

@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?

Whoever gives me the most business and has an excellent close record will first be presented with off-market opportunities. 

This will get you 90% of the way there and should be sufficient.It works the same in a saturated area, it's just more to sort through.You are aware that STRs in Denver are allowed only in certain zones and you must live onsite?

I second the proposal to get @Brian Burke's book The Hands-Off Investor.

But also be aware it appears their platform has changed in recent years.

Depending on the condition you'll command a better price on the MLS vs. off market.

I underwrite my own way and I am aware that everyone has their own version of calculations. 

A quick internet search led to quite a few complaints by people claiming to be ripped off, had deals fall through, or simply getting the run around each time.