Add another orbi to my rbr850 system

[AaronK26]

I have an RBR 850 system with three heads can I add a fourth to the system? and if so what model number is it that I should get?

Thanks

[FURRYe38]

https://kb.netgear.com/000062035/How-many-satellites-can-you-add-to-an-Orbi-WiFi-System

30 feet or more is recommended in between RBR and RBS to begin with depending upon building materials when wirelessly connected.
https://kb.netgear.com/31029/Where-should-I-place-my-Orbi-satellite