It will work until it does not is the thing - and when it does not, the result will be a OOM situation on dgraph, and the suggestion you will get here is ‘add more ram’
The standalone image has 1 alpha and 1 zero - if you hit any corruption, the whole cluster is dead. With 3 alphas and 3 zeros, a corruption can be fixed by removing the effected node and adding a new one.
If you don’t care if your cluster OOMkills and possibly looses all data to corruption, then you can run whatever you want - but that is unpalatable to most running a real app.