• Get the second or third one as they are the most recent 'AC' wifi protocol.

    Usually there will be an option when setting up to clone your router's existing WiFi network automatically, then the ID and password will be the same for all wireless access points, and any modern device will just connect to the best one as you move around.

    (It can be useful to use different IDs when troubleshooting coverage though.)

    Also, double check that your main router is AC and transmitting on both 2.4GHz (slower, longer range) and 5GHz (faster, shorter range, blocked by walls).

  • Looks like that is previous generation wireless N rather than AC. Probably a good idea to consider replacing that first. I don't actually know about ISP provided routers, do you have to pay for upgrade to a newer one?

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