@Tony W. tertiary markets have been strong for a long time, like 9 yearsish time. Demographics are a cycle, almost every demographic (economic and population) has seen the tertiary markets of Portland outpace Portland the past year or so. So yeah, if you want to house hack in a tertiary market, that's a solid option.
My 2 cents on house hacking
1) Find a property where you want to live short term and rent out long term. If you really want to be a real estate investor (buyer), be where you get excited. Make relationships in that area and go buy some real estate.
2) The tertiary markets are most likely going to have a higher property tax per unit because of the way our property taxes work. It's a big factor for me and why I invest almost exclusively in the **** hole neighborhoods of the 90's. Way better tax to purchase/rent ratio.
3) Small plexes are a great way to maximize leverage, lower cost of debt and maximize economies of scale. That's one thing I would go back and teach myself if I could.....my first purchase would've been a 4plex and would've signifcantly changed the route I went and experience I earned my first 8 years.