Attorney Client using Pro account

Hello, I have an attorney client that has a Pro Account and we are installing the Yealink A20 system in his office.  I am not a "zoom" expert but need to understand if the hardware we are proposing will function the way he is accustomed.  He does mediations and typically he has clients in his conference room where the A20 set up will be.  He starts his Zoom meeting on his laptop in his office and then will typically physically go into the conference room and join the clients.  He will then go back into his office and "mediate on zoom" and needs to ensure the clients in the conference room will not be able to "participate in the mediation"

He does not use breakout rooms.  Will this A20 set up support this and is the Pro Account the appropriate type account to do this scenario?  He is leaving his firm and going out on his own and really wants to replicate the way he has been functioning.  I appreciate any guidance.