My neighbor got this set for his 3000 sq ft colonial. He has his main one in the basement and only deployed one of the units and he has good coverage all through the house. Recommend setting the 5ghz band to 80mhz channel width from 160mhz to not hog the band and get a little further range.

Trace all of your coax and see it it all comes together with splitters so that you can add 2 adpaters and they can talk to each other.

Here are some diagrams from GoCoax that show how to use it. It’s been off line today, though.

Look at UniFi consoles and the UniFi line.

Read r/Ubiquiti subreddit.

Fore wired connectivity to your bedroom, MoCA adapters using the coax would suit you best. Here are some diagrams from GoCoax that show how to use MoCA. Be sure to verify that all splitters are 5-1675mhz and that PoE filters are installed as shown on the diagram that applies to you.

Once you have wired connectivity in your bedroom you can add an Access Point (AP) and set it to the same SSID as the router.

So you posted this 3 times? WHY?

https://blog.cloudflare.com/introducing-1-1-1-1-for-families/

If you have room above that panel, I would recommend getting a bigger one that suits your needs that has the same width. Then cut the wallboard above so the new one fits into the space and mount it.

So the correct length of this patch cable

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Best to test it and verify that it does so with other known 1gbps connections. If it always is 100mbps , then reterminate and test again. Most likely one of the wires didn’t connect the you are only using 2 of the 4 pairs.

Seems quite all right for what you are setting up.

The only question I have is whey cat 5 cable when cat 6 is so much better? May not make much difference now, but in the future higher throughput might become an issue.

As far as whether to set up load balancing or fail over is something you can play with until you find that it operates the way you like it.

You can always get one of these patch cables SC/APC in the length of your choice to replace that blue UPC cable.

Best setup for APs or mesh satellite units is when they are connected via wired ethernet cables to their location. If you don’t have ethernet wiring in your house, perhaps you have coax which would allow you to use MoCA adapters to get wired connectivity. Here are some diagrams from GoCoax that show how to do that.