So the 3 routers are hard wired together, and I’ve set router 3 up as a wireless access point using the same instructions above. If I wirelessly connect to router 3, I can’t access the Internet, or ping any other device on the network. Should this configuration work, or does router 3 need to be connected directly to the main router?
Yes, they can be daisy chained, though there are downsides. Mine currently are, & a split in the wire from 1 -> 2 a few weeks ago meant all 5 of my APs went down. I only had internet access in my living room. Wiring each independently would require wire runs that are either too long or just strung across floors & stairs though.