eero Beacon for UK and EU market
Please consider eero Beacon, aka "eero Built-in" for devices such as the recently released Echo Dot 5. This feature is US/Canada only but is equally ideal for the UK (and EU) market.
The least Eero could do is explain up front in this article that it's only available in North America (https://support.eero.com/hc/en-us/articles/8959246792859-What-is-eero-Built-In-). This detail in buried right at the end after all the guidance on getting it working had been laid out. The first question should be "Are you in North America?"