Server network

so me and my friend made a server network consisting of a proxy hub and backend server for cobblemon my proxy runs velocity and the other 2 run forge loaders but has a fabric mod pack installed how do it get it to where my plugins work with the mods like luck perms and its prefixes showing across all the servers, i have placeholder api installed but that doesn’t do what it’s supposed to so if there any suggestions on what i should change that would be appreciated
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