Saved my day !

Picture worth a 1000 word.
When you see your WIFI signals affecting your place, you can then decide how to best compose with your wifi exposure.
All that for Free!
Not 100% intuitive to start though with the « walk around your place to scan you plce from a blank screen » but obvious once you think about it.

Ttggyy about NetSpot: WiFi Analyzer, v1.3.415