I was wondering the same thing. I have three eero Pros all connected with Cat6 to my switch. On the main page these show the wired connection icon (<->) but on detail page all but the gateway say the connection is Wireless. I've checked the switch, there is plenty of activity going to the remote eeros.

I am wondering the very same thing.  I was hoping that each of the eero devices would work as wired devices back to my switch, but am seeing the secondary eero as wireless connected.

Please provide the solution to ensure that each devices is hard wired back to the switch.