Should each of these apartments have their own internet account/hookup, or should I have one WiFi account shared in the building and they achieve security through a VPN?

I think you can do all that with myalarm.com the devices will be attached to their wireless network and they send alerts to your phone and you can also monitor the works from your phone or server.

I am using a process server to serve the 60 day notice, who do I serve?

NinjaRMM has developed a cloud-native platform that remotely supervises an organization's networks, servers, laptops, workstations and other devices.

Just sticking it on the door isn't enough, he has to sign for it or be served by a process server whom we have to pay.  

To answer your question, if you know where she works (from LinkedIn), just hire a local process server and have her served at her work and don't waste any time figuring out where she lives. 

Basically it's a gig app to recruit process servers, workers to clean out properties, and something called "Eviction standby."

@Jose SalazarUnfortunately there are a lot of websites and email servers that are rejecting non US IP address.

Nor are hosts and servers used to making sure rebellious patrons wear masks or observe social distancing recommendations.

I am only a server/ waiter atm Making around 20 K to 30 K a year.