Orbi, roaming and sticky clients

What do you mean by sticky clients? 

Location, distance and placement is key to any MESH wifi system.

What is the size of your home? Sq Ft?
What is the distance between the router and satellite(s)? 30 feet is recommended in between them to begin with depending upon building materials when wirelessly connected.

5Ghz is more effected by building matierals than 2.4Ghz. 2.4Ghz can go farther than 5Ghz. 

Roaming is a client side handling process. The Orbi may help this in some ways, however it's up to the client HW to figure out what signals is best and to transition to a better signal strength seemlessly or not. 

Some reading on WiFi Roaming:

https://www.smallnetbuilder.com/wireless/wireless-features/33195-wi-fi-roaming-secrets-revealed
https://www.smallnetbuilder.com/wireless/wireless-features/33196-wi-fi-roaming-secrets-revealed-part-2
https://www.smallnetbuilder.com/wireless/wireless-features/33197-wi-fi-roaming-secrets-revealed-part-3
https://www.smallnetbuilder.com/basics/wireless-basics/33180-how-to-fix-wi-fi-roaming

RBS are required to connect to the RBR when wirelessly or wire connected. 

Others have posted having up to 6 satellites connecte to one RBR. Again, depending upon size of home and building materials, will help you figure out how many satellites you may need. I have a 5000sq ft home and use one RBR at one end of the home up stairs and 1 RBS at the opposite end 40ft away, wired or wireless, have great coverage. 

Not much status other than status of connected satellites to the main base router. 

The Orbi only works as good and what it gets from the ISP modem and ISP services. These should be checked to ensure ISP services are working well for any connected wifi router.