For wifi/ access point only, you have the option of putting the Google Wifis in bridge mode:
But then you'll loose functionality like:
- Roaming:
- Each Google Wifi will be seperate, non cooperating devices.
- Single management pane:
- Must create a seperate Google Home home for each bridged Google Wifi device.
- You'll have to manually set SSID and password for each of the pucks.
You'll still need a router, firewall, NAT, DHCP in your setup (what the primary Google Wifi does), how are you solving that? I only see mentions of a PoE switch.
I'd suggest you read up on wired backhaul (https://support.google.com/wifi/answer/7215624?hl=en) and consider having one Google Wifi behind the modem, then a switch, then connect all other gear to that first switch directly, instead of going through the other pucks. But be aware, managed switches + Google Wifi can give you other problems, for instance with STP (spanning tree protocol).
I don't work for Google.
