Reddit mentions of Ubiquiti EdgeSwitch 16 - Switch - 16 Ports - Managed - Rack-Mountable - Black (ES-16-150W)

Not OP, but we've deployed Ubiquiti products in a few of our enterprise customers and it is running great. I am not sure how much you already know about networking, but I'll explain for anyone else reading.

First, some background to fully understand what it is you are trying to do. The thing that most consumers call "routers" are really three things: a router, a switch, and an access point. TLDR the router portion is the thing that actually moves traffic between machines, the switch extends how many physical ethernet ports you have, and the access point gives you wifi.

The Ubiquiti Access Points (UAP) are just access points. You will still need a router to route traffic, and your consumer one will work just fine for most people. If you are looking to get something more SOHO, Ubiquiti also makes their own router/firewall (check out USG, or ideally EdgeRouter). For all intents and purposes, it is a pretty good idea to separate the roles of your network (physical appliances for the router, firewall, wireless, etc...), and you can have as many UAP's as you'd like for wireless. The UAP's run off of Ubiquiti's 24V Power-over-Ethernet (POE), which can be provided via a POE injector or with a Ubiquiti Switch (either Unifi or EdgeMax). So for a basic network, you'll disable the wireless functionality on your consumer router, and plug a UAP into a port (obviously you'll need to pass it through the POE injector first). Rinse and repeat for however many UAP's you want, maybe another one on the other side of the house for example.

The UAP is pretty useless on its own, though. It needs a piece of software called the Unifi Controller. The software is free, and you can run it on Windows, Linux, or with Ubiquiti's appliance called the Cloud Key. Within Unifi Controller, you'll setup the UAP's; e.g. setting the visible wifi name (SSID), security, channels, etc... It isn't too complicated, the interface is really intutive and anyone who is even slightly technical could figure it out. The controller also serves another really important feature, which is zero-handoff. As long as the controller is running, your device will connect to the access point with the best signal. This is the seamless switching you asked about.

Ubiquiti also is focused on mesh networking, although we are generally pretty against that for businesses for reliability reasons. Of course, the exception to that is Cisco Meraki, which is a hybrid that will self-heal. If you lie and say you are an IT professional, you can get a free Meraki with a 3 year license. Just make sure that you follow the rules.

As a note, I would stick to the UAP AC's. They are the newer version and run great. For consumers, the UAP-AC-LITE is going to work fine. Obviously there is more to networking and wireless solutions than what I went over here, but this is the general gist of it.