WiFi Booster Coverage?

[wireless]

I'm wondering if someone can explain how the Wifi Boosters work in conjunction with the T3200. I have added 4 boosters and 2 of them say i should move them closer to the router. That seems counterproductive. The first booster is connected to the T3200, the second is about 12 feet away and goes through 4 walls. The signal shows good (blue) signal strength is -59. The third booster is approx 10ft away from the second one and almost line of sight through doorways. Its shows OK (yellow) at -77. The fourth booster is approx 14 ft from the second booster and 20ft from the third booster. It also shows OK with a signal strength of -73. I'm wondering why the Connect app recommends moving them closer to the modem? I thought these were a mesh setup and worked together. Should I be changing settings on the T3200?
Thanks for any input.
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