The speed test in the eero app represents the speed between your gateway eero and the internet.
The test isn’t the speed between your eero and your Wi-Fi device the eero application is running on. For this reason, the speeds represented in the app will not change as you move around your home.
The speed test in the eero app may also be different from an internet speed test you may run from your devices. This may be due to your device’s Wi-Fi signal, interference, or performance capabilities.