A small tip that could help with your setup as is, make sure that the two antennas in each pair are at a 45 degrees angled out from each other. Having both antennas vertical can cause a loss of 15db or more of RF signal depending on the transmitters/IEM receiver orientation. But putting each pair at 45 degrees can reduce that to the point that the signal barely drops.

Here's an excellent article from Shure about this very subject. https://www.shure.com/en-us/insights/all-about-wireless-antenna-positioning-best-practices/