I can answer point 1. The answer is yes! We have chromecast audios in 6 different rooms (in fact they are all in one place, with speaker wire running to speakers in different rooms. Works flawlessly for me, no lags between rooms at all. We also have google home hub, google home and multiple google home minis, oh and a lenovo smart alarm, and they pretty much all work together with minimal issues.
Cool, thanks! Just wanted to hear it works and wouldn't be wasted money buying a second one (not least as I don't know what returns policies might be trickier if I have to source one from eBay etc)
I can answer point 1. The answer is yes! We have chromecast audios in 6 different rooms (in fact they are all in one place, with speaker wire running to speakers in different rooms. Works flawlessly for me, no lags between rooms at all. We also have google home hub, google home and multiple google home minis, oh and a lenovo smart alarm, and they pretty much all work together with minimal issues.