UHR Mic Help

Hello everyone, thank you for any input you can provide on this problem that I am having. I work in IT as an IT Director for a small county, we do not have a large budget and I was given $3,000 to set up a larger room with wireless microphones, a camera and a way to record Zoom meetings. (I love being lumped in with AV people as an IT guy, lol)

My solution was a Logitech MeetUp camera and an external 16 GB SSD.

On to the main point, I ordered two sets of these Xtuga wireless microphones. They arrived last Wednesday and I got them set up Friday. Now I am worrying because there is a large meeting that I am setting this room up for this Friday, February 28th and I can only get 8 of these microphones working at any given time.

The receiver does not allow me to change the frequency but I can change the frequency on the microphones.

Since I ordered two sets I have two microphones each channels 1-8 (Ch1 Ch1, Ch2 Ch2, etc)

As I cycle the frequency on the microphone the microphone with the lower frequency is what gets picked up by the receiver.

I cannot get anymore than 8 working at any given time and it is always one microphone per channel that works. Is it at all possible to get these two systems working together?

My configuration is as follows:

The two receivers plugging into a mixer via TRS cable

A wired microphone plugging into the mixer via XLR

The mixer L and R out going to Channel 1 and 2 (respectively, L to 1 R to 2) of an audio interface

The audio interface plugs to my computer via USB C

This meeting is for public comment and streamed via Zoom. Thank you again for any input that you may have. I am by no means an AV guy and this project was more or less foreign to me. I realize these microphones are far from "expert audio" but with such a limited budget and the requirement of a wireless solution I figured they would work just fine. I opted for these ones because a user on Amazon commented that he was able to get two of these systems working together in one conference room.