USB-C WiFi adapter?

Yes, if you need it to be wireless you will require an additional Wifi adapter. I don't believe there are any USB-C wifi adapters, so again yes, a USB A to USB-C adapter will be required.

Something like this: USB C to USB 3.0 Adapter 3 Pack - Amazon.com

If the camera can only be accessed by making it a Wi-Fi access point and connecting the laptop to it, that’s too bad, and yes, in that case you’d need a second Wi-Fi adapter indeed. But this may not be the (only) way the camera operates. If the camera can be connected to an existing Wi-Fi access point that the laptop is also connected to, then they can communicate with each other. I’ll take a look at the manufacturer’s documentation if you can point me in its direction.

I don't see why another Wi-Fi network interface would be necessary when your laptop already has one. The document camera should be able to connect to the same network as the laptop, if it has Wi-Fi connectivity. Then they can communicate with each other. A USB connection might be necessary for the initial setup of the document camera, like telling it which Wi-Fi network to connect to.

Alternatively, I can use USB WiFi adapter with a USB-C to USB-A adapter, but it always feels like less connections is more reliable and stable.

This isn't the case with a simple USB-C to USB-A 3.0 adapter, I wouldn't worry about it. I see there are lots of $10 adapters like this on Amazon, they should work perfectly. I have a $2 one, never had an issue with it.

on page 11, it shows how to connect it via USB. that would be WAY simpler setup.

If your Mac is connected via Ethernet, you can turn it into a Wi-Fi Hotspot by "Sharing" its Internet connection over its built-in Wi-Fi hardware.

why don't you just get a USB camera and be done with it. That camera sound way too hard to set up.

I looked through the docs and I agree, the only way is to use a secondary Wi-Fi adapter.

Grant Bennet-Alder wrote:

on page 11, it shows how to connect it via USB. that would be WAY simpler setup.

...we want the camera to be wireless / able to move easily around the room, which would be ideal for our needs: https://www.ipevo.com/support/qa/vz-x