The only way i got this 5 port, 4K HDMI switch to behave is by combining it with dummy HDMI adapters (here), In my setup, they are limited to 30FPS (Not sure if this switch can handle more, but the dummy HDMI adapter itself is limited to 30FPS at 4K)
Once the adapters are at the endings of all 5 input cables, the switch works perfectly, but what happens without them
Without them, there are a couple of problems, the PCs switch the video output off, and there is a delay before it comes back once it detects a screen has been connected again, so you keep clicking till you get lucky with the monitor you are looking for, not to mention that in the case of multiple monitors, the operating system keeps changing the monitor setup assuming that screens are coming and going !
the switch comes with a handy remote control (That i don’t use because the button is right here in front of me), but it will be handy in case you are using a PC that is relatively far
Also worth noting is that it can identify which screen are connected, so you do not need to go through all 5 inputs if only 2 are connected, it will only switch between those two
in any case, let me know in the comments if you have any questions