Running mutiple Hitleap Viewer with only Sandboxie?

So I've done some researches on the internet, and I've found out that you... can run mutiple Hitleap Viewer with Sandboxie and a Proxy (using a program called Elite Proxy Switcher). But i have some problems with the "Proxy" one. So I ignore the proxy and only use Sandboxie. Well... it seems to work smoothly, no problem at all. But do you guys think that using a Proxy would be better?

Thanks