I would literally go out, pick a neighborhood, and walk door 2 door knocking.

Have a weird layout property where the front door is on the 2nd floor and there is a set of wooden stairs to get up there.

that we’ve learned in our 24 years, managing almost 700 doors across the Metro Detroit area, including almost 100 S8 leases.

You can door-knock, build a referral base (but you probably need the business first), send out mailers, do Google/Facebook ads, or use people like Nick and Lead Minning Pros. 

I assume that  if you knock on the door they are not going to be receptive to your request to vacate.

We’ve had 6 showings in the past week alone, which is already a lot, but the most concerning part is what’s been happening during these showings.Here’s the real kicker: there have been showings (with prior notice given) when we weren’t home, and my cameras caught prospective buyers entering unaccompanied—no realtor, no landlord, just strangers walking into my occupied home.In one instance, my husband happened to be home and answered the door.

Start small - get yourself a househack, learn from your own experience of owning the rental property you live in, continue to educate yourself with reliable resources, and then worry about the next home.Having just one solid investment will put you ahead of most Americans than trying to find a way to buy 10 doors out of state in an area you don't even understand. 

Hi @Jackson Hanssen Ty for answering.I don't want to merge the two LLCs because I'd like to preserve family only ownership in my family LLC (LLC-A) for the same number of doors.

By East do you mean cities/areas close to the Yosemite National Park entrances? 

This emphasis on scaling as quickly as possibly means you’re going to become a door chaser and you will look for markets that cater to that objective which normally means weak underlying fundamentals.