actually your should consider doing a scrog it will give you the best yield for the light you are using and there is no reason why you couldnt harvest them all at the same time.
if your using clones from the same mother they should all finish at the same time so that isnt a problem with scrog.
would suggest using a tub and do about 3 clones and either do a scrog or lst them to get the most out of your light.