How to Socket.IO Multithreading on a Raspberry Pi?

I have a socket.io server which listens to sockets:

io.on('connection', (socket) => {
    socket.on('myEvent', function(data){
        socket.emit('eventReceived', { status: 1 });
    });
});

I know that Node.js and Socket.IO is not working in multithreading, so I wonder how to effectively handle multiple clients, sending a myEvent at the same time.

I've read a few things about Clusters. Would it be as easy as just adding the following code infront of my project?

const cluster = require('cluster');
const os = require('os');
const socketIO = require('socket.io');

if (cluster.isMaster) {
  const numCPUs = os.cpus().length;
  console.log(`Master ${process.pid} is running`);

  // Fork workers
  for (let i = 0; i < numCPUs; i++) {
    cluster.fork();
  }

  cluster.on('exit', (worker, code, signal) => {
    console.log(`Worker ${worker.process.pid} died`);
  });
} else {
  //my socket code
}

I've also read a few things about Redis, how would it be useful in such a case? Is it effective on an Raspberry Pi? Would it be possible to create a new thread for each user?

Thanks for any help :)