If you use EMAs that are far away, the convergence point may be ridiculously far away from the chart. I recommend using 'Scale Price Chart Only' with this script.
I think you can use this to organize your watchlists if you trade crossovers. If your cross is completely out of the chart, its symbol can be down below, because the cross is unlikely to happen in the next candle.
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.