Eero Wifi Router 6 with ATT Fiber Router?

Hello, the new Eero wifi routers are on sale and I wanted to buy one but I only wanted to use it as sort of a stable extender with my ATT Fiber router. But I'm confused on a few things, does the Eero routers work with the att routers and can I pair it as an extender so that I'm able to extend my wifi across my house. I don't want to give up the fiber section of my internet so I wanted to use them together to extend the signals but I don't know if that's possible. If so, how may I go about doing that. I have Fiber Lightspeed internet (1000mbps).