Luma as main "wired" router on fiber

I have 3 old Luma's lying about and was trying to figure out if I could/should turn one of them into a "wired" router to put behind the ATT&T router for my fiber connection that I hate (the router not the fiber).

Anyone using one of these things as main connection router? Does anyone know if you can get full throughput ( currently wired connections can get 850 mbps and above) or should I go find something newer?

Thanks for any advice !!

The routing limit for ipq40xx is roundabout in the 300-350 MBit/s range.