Here's how my day ended. I had TP-Link technical support doing TeamSHare as they sat on my laptop trying to figure out if they can get their Decos working (enable 5ghz).

After 3 hours of sitting with them, they were able to get 5ghz working on one deco, but now the other 2 decos no longer work and can no longer connect to the network.

This isn't mesh now, this is just a single router, and a cr*ppy one at that.

TP-Link, please just refund me for 4 w7200 DECO units and I can go buy something that actually can do 5ghz wifi.

If your tech needs 3 hours to figure out why the system is not working, the system is broken.