Switch between 18-?? hdmi PC sources for live production
Only the 4K models of the Atom switchers support 1080p in 60 fps, like the ATEM 2 M/E Production Studio 4K.

Although a software control panel is included, I would prefer a hardware panel. Switching between 18+ input sources will be so stressful, that you don't have time looking where the mouse pointer is. A hardware panel has big buttons and knobs that you can operate without looking at it.

These switchers all work with SDI, because HDMI only works with cable lengths up to 10 meter, whereas SDI cables can be up to 300 meter long. See this comparison.