multiple gaming devices

Hi, I've a ASUS AC88U running Merlin 386.2_beta3. I've installed FlexQoS (as I believe CakeQoS is not available for my model). Now I've set up a "Gaming" rule as detailed in the GithUB Wiki. However, how do I set this up for multiple gaming devices? I.e: PC 2, Xbox, PS4 and PS5? Each of these...