Hello @GeirG
Yes, what you have proposed should work very well, as long as the Ethernet switch you're using is an inexpensive, unmanaged switch. This will ensure you don't running into issues with the switch attempting to do "loop detection".
But, it's a little unclear exactly which WiFi product you have (Google WiFi, Nest WiFi, or Nest WiFi Pro). You've tagged this post as "Nest WiFi", but labeled your devices "Google WiFi" in the diagrams. This is important, because the Google WiFi units all have Ethernet ports and will work as you have proposed. But, the Nest WiFi units aren't the same – only the Nest WiFi Router units have Ethernet ports, while the Nest WiFi Point units do not have Ethernet ports and therefore can't be wired this way. Meanwhile, the Nest WiFi Pro units are more like the original Google WiFi – they all have Ethernet ports.
