Thanks for more details/context.
Four is a lot (of Nest Wifi Pro units). Do you need that many? Too many can do more harm than good, due to the overhead (traffic going between the Nest Wifi Pro units themselves) and interference. More on placement and how many you need:
- https://support.google.com/googlenest/answer/7182840?hl=en
- https://support.google.com/googlenest/answer/7183150?hl=en
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It's also best to create a star topology, as in placing the main/master unit in the center of all the other units. As in, place the main unit in the center of the house, rather than at some outer point. It will give better performance and reliability, as it gives fewer jumps between the units. I've tried to visualize the pros of this approach like so:
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It's also worth considering going wired backhaul, as in pulling ethernet cable between all the Nest Wifi Pro units, instead of wireless backhaul, a.k.a. mesh. This will give better performance and reliability. Add an unmanaged switch behind the primary Nest Wifi Pro unit to get more LAN ports, rather than daisy chaining them. Here's a diagram of how that can look like:
More on wired backhaul:
If pulling ethernet cable everywhere ain't an option you could consider ethernet over coax (MoCA) or powerline.
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One last thing: Is your ISP equipment in bridge/bypass mode, so you avoid double NAT? If not it can hurt performance and reliability, and it can create strange peoblems. More on why double NAT is bad:
