I either use all cash or have been able to purchase 100% ltv via local credit unions.

BrianNothing prevents tenant from running the water, kicking holes in walls and door, or other vandalism.However, these things seldom happen as retribution.More likely, a tenant fills up an inflatable pool every other day in the summer, or fails to report that the kitchen drain is leaking, or that the boyfriend beats her up every weekend and busting up the place, or that tenant lets a dog do his business on the carpet, or overflows the tub because they fell asleep.While a good tenant will agree to a fair water policy; the court will typically throw out the policy in an eviction.Keep in mind that you can get a leak notification from water department via “clear-reads” through the mycleveland water website.Usually bad tenants are multi-dimensional... they tend to follow a pattern... low credit score, extension criminal background hits such as driving with suspended license, expired plates, drugs, panning the rent late, refusing to pay the water, violating trash pickup guidelines, police calls by the neighbors, no-show for service calls, removing smoke retractor batteries for the kids toys, not replacing burned out lightbulbs, not taking care of the yard (in a single family”, busting blinds and screens, etc. 

It's those maniacs that buy homes cash via quit claim deed off of craigslist that really get screwed.Make sure your property manager is a licensed real estate brokerage.Understand you can not eliminate all risk, only mitigate it.

Or is it squeeze/landing pages via Facebook marketing campaigns?

Background in construction via family and education.

Buried in the detail provided by MLS via downloaded Excel file, look for the column that shows buyer financing. 

Most agents are compensated for their efforts via a commission that is typically 3%, and you're bypassing that and asking them to do the lion's share of what is important with wholesaling for you. 

I wrote a top 10 takeaways from Secrets of Successful Syndication, which you can find on BiggerPockets via search.Others in Texas which I have not attended but are popular include Think Multifamily's events and Brad Sumrok's Rat Race 2 Retirement (and others).Do you want to learn to syndicate, or to invest in multifamily on your own?

I have never set up to buy low end rentals via any kind of mail or door knock campaign. 

It all depends on what you want to achieve via REI.