KE can support the application of PC four video output, you can use KE6940ATx2, KE6940ARx2 or KE6900ATx4, KE6900ARx4.

Only need to connect the USB of the first group of KE transmitters to the PC, the USB of the other KE transmitters do not need to connect to the PC.

If Matrix mode, you would need to set a Tx Group of CCKM, check the option "From the same PC video output",  and you dont need to enable the boundless switching function.