methods to avoid fluctuating signal strength in trilateration

I am trying to create a wifi trilateration project using 3 Raspberry pis.

I can capture packets from all 3 pi's to a web server but even if a mobile device stays in one spot, i will still get wild fluctuation in signal strength results.

I have been researching but can't really find a solution to getting a consistent signal strength.

I have seen the fingerprinting method but i would like to avoid it, since it requires a lot of setup and when moved has to be re calibrated.

If you could point me in the right direction, i would appreciate it.

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