I would think the odds are pretty good if you started with 3 or 5 small juvenals 1-1.5". I do not believe they really sex until about 2"+ This is basically how I obtained mine. The LFS
had a shipment in a tank no bigger than 30g and picked mine after observing for a couple of days when they were down to 3.
Hiding places will be key and LR
would not be needed. PVC
work great for this as well and will allow for treatment if needed while in QT.
In theory even two could even pair if bought small enough from the same tank. People get in trouble when they try to get larger more mature clowns and then pair them.
If you go with the multiple fish route just make sure you have a plan for the odd fish out.