You can use software like propstream or something similar to pull lists of all 2-4 unit properties in your target areas.

I have not been able to find any software or websites that allow skip tracing in Canada.

Have you done any research on short-term rentals in general, the Houston market specifically, the software tools being used in the STR industry, the market data and research info available? 

Does anyone have any recs for a management software for STR’s?

If you intend to expand to multiple property ownership, or if you do or intend to have other assets you wouldn’t want to jeopardize by real property ownership liability; then spending $350 - $550 to set up an LLC, and $125 for tax software to fie taxes, and 3 minutes to go online once a year to file a one half page information report, seems like a small price to pay for the protection, peace of mind, possible retirement plan benefits provided.   

Then you've got the license fee ($200ish), joining a local Realtor association (~$150) and national realtor association if required by your local board (another $150), the local MLS access fees ($300), e-contract software ($80/mo), E&O insurance (maybe $100/mo).

Buy or inherit and hold all their lives while working the properties for income.I've seen teachers, firemen, software engineers and all sorts of people utilize both strategies successfully.

Or use a screening software like showmojo, and allow tenants to do self serve showings.

Just need to look at data in PM software and could find out.

It is very easy to get lost in the feature soup of software.