What will I see at Ecobee and Beestat for two thermostats?

Hi.
My house has two thermostat zones.
I upgraded one to Ecobee for the wifi control. It has one remote sensor.
Beestat is a great addition to analyze the data.

I might upgrade the second zone to an Ecobee. But it’s not super important. Probably I’d put in two more remote sensors.

I did a bit of research but am unclear how Ecobee’s app and Beestat integrate two Ecobee thermostats in one house.

What “seemlessly” integrates for control and analysis/reports?
What doesn’t work out that great, or is annoying, for the two apps when there are two thermostats on the same floor of a house.

If this has been answered elsewhere, I’ll appreciate a link. Thanks.