Before you buy the orbi system - what you need to know performance and feature wise

Hi all, this thread is very informative, thank you. I'm not sure if this is the correct place to post my question, but it seems to be a related subject:

Context: My team works in a shared space with a single modem and router with slow speeds and spotty connectivity depending on where you're located in the building. I'd like to purchase the Orbi setup to enable my team to access higher speed connections without loss of coverage. However the other tenants in my space have no need for this enhanced connection, and thus will not chip in for the system. Therefore I'd like to setup a private Orbi network for my team to provide them with the maximum bandwidth, and keep the other building tenants on their old router. Is this possible?

My understanding of this thread is that it is possible, by connecting the modem to the Orbi router, then hard-wiring the old router to the Orbi router. I would use the Orbi router in the Router Mode because the old router is unreliable. But then I'd setup a new network SSID and PW for the Orbi network and leave the old router network the same as before for the other tenants.

Would this work? And is it the best setup for the context outlined above?

Thank you in advance for your thoughts.