Equivalent of UNET Syncvar

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Hi,
What would be the equivalent of "syncvar"?

Context: I have a script on an object and I'd like to keep track of the number of players standing on the object as they enter/exit a trigger. Only n players are allowed at one time and the code should "teleport" any surplus players a little distance away. Would something like syncvar be the best way to track this across the network (there will be multiple such objects)

If no syncvar, can I store variables on the server so that each client can decide what to do. Room Properties maybe? Is that the best way?

Thanks!