Finding someone proficient using Zoom with OBS

Hello,

In early 2023 we will have a virtual conference, we plan to have around 1000 people join us worldwide.  The conference will be over 2 days with 6-8 keynote speakers. The speakers will be in different locations around the world.  We will also have an MC for the event who will be in their own separate location. 

I am looking for someone who can give me advice for using OBS with Zoom. It sounds as though the presentations would need to be pre-recorded and played from a single location using OBS.  We are considering using  Zoom events or another platform. It is important that our presenters are still able to be on live during their segment. We will want them to be able to answer questions from the audience at the end of their presentations. 

Any and all input/help is appreciated.  We certainly are open to hiring someone who is experienced and proficient with OBS & Zoom.

Thank you.

Justin