Actually, I would use the Edge line for exactly what it is marketed for e.g. your network interconnect (internet <-> internal network) and internal network back

Actually, I would use the Edge line for exactly what it is marketed for e.g. your network interconnect (internet <-> internal network) and internal network backbone and the Unifi products to connect the Edge powered backbone network to devices. This way you get the best of both worlds. Especially since the EdgeRouter line is absolutely one of the best on the market when it comes to network throughput (which you really want if you have 1000mbps+ fiber behind it)