It may be that I don't understand your question but are you talking about using MoCA adapters to wire your Access Points to your designated Google WiFi router? If so, that should be all fine and good. In fact, my view is that if something can be wired, it should be.
If you aren't daisy-chaining the AP's to the Google router then you will need to have them plugged into a switch with the Google router in between the switch and ISP modem. That way your router is acts as the master. I honestly don't know what engineer at Google came up with the daisy-chain idea but it is dumb. No one wires a network that way.
I just wanted to jump in real fast to see if you saw DoesNotCompute's reply and to see if you still needed some help on this or if you were able to get it sorted out. If you are still needing some help, just let us know and we'll be happy to continue helping.
Just one quick final check in here since activity has slowed down. We'll be locking the thread in the next 24 hours, but if you still need help, I would be happy to keep it open. If there's more we can do, just let me know.