It depends on what you call "knock off line", usually it will create glitches in the working (and at time knock off line) because the Laptops might keep alternating between APs.
It will do it even if the two APs are more apart but are within the same room.
Wireless frequently fluctuate, if the fluctuation is more that few sec. most laptops will shift to the AP with the strongest signal.
In such case the solution is to assign different SSID to each and configure the Laptop with a priority toward a specific SSID.
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