I wouldn't recommend an edgerouter for a small office, maybe something a bit more serious. I was describing what I'd recommend for a residential/personal small home office setup. Mine is basically a 32x8 capable DOCSIS3.0 cable modem that is a dumb L2 bridge to the cable ISP's CMTS, an ER-X router, a managed mikrotik fanless L2 switch for the LAN, and several $79 UAP-AC-Lite (802.11ac not wave2, 2x2 MIMO, dual band APs).

>residential/personal small home office setup.

Home/Offsite - https://www.ubnt.com/unifi-routing/usg/

Office - https://www.ubnt.com/unifi-routing/unifi-security-gateway-pr...

Large Office - https://unifi-xg.ubnt.com/usg-xg-8 (sweet 1U screen!)

$110, and same management interface as the AP's and switches. As you can tell, im prioritizing all-in-one management very heavily. One, managed, cloud, location for all my devices (minus sdwan, hosted by that vendor.) But the USG can do Auto IPSEC, so if you have 5 of them, you can tell all 5 to automatically keep connections to each other open. I havent fully tested a complex mesh of USG's yet, but id like to. It's getting close to even sdwan being expensive, compared to what these things can do.

One of the things I like the least about the Unifi management interface, is having to edit each site separately. If i want to make a router or ap/ssid change, I have to open each site.

From what I understand, some features on the USG aren't available unless you manipulate some JSON files, whereas they're exposed in the UI in the Edge Routers.