Simple video mixer for ptz cameras in Zoom calls

[benz0]

Hi folks,

I'm looking to get two or three ptz cameras to be used for a zoom meeting with multiple participants at our end.

I'm thinking have two, max three ptz cameras with one or two simultaneously being displayed in Zoom as our camera feed.

To achieve that I'll need a usb video mixer. I'd like to have the following modes: picture in picture, side by side, and perhaps wide angle shot at bottom of screen with a zoomed in speaker at the top.

Any recommendations for the mixer and also for ptz control?

Blackmagic Atem mini is recommended widely but the PiP mode doesn't seem flexible enough and won't save as a preset if you adjust it.

Budget for all kit is under 9k. Emphasis is on simplicity so that more users can be trained to operate it.

Many thanks