I’m currently in a situation where I’m responsible for optimizing the Wi-Fi network in a moderately sized office. The challenge is that some areas have weak or no signal, and we suspect there are dead zones. We need to precisely identify these areas to improve our network coverage.
I saw your comment that you’re in a iOS/macOS office. If you get stuck, macOS has a built-in WiFi scanner that displays the optimal 2.4 and 5ghz channels for a device’s location. This might quickly help improve some areas and here is an explanation of what it does.
https://www.imore.com/how-use-macos-wireless-diagnostics-get-best-possible-wifi-settings-your-area