I guess that depends on the size of the container. I wouldn't put more than two in your standard hatchling tub. If you have a blanket box, you could have 5 or 6. The more in there, the higher the risk of fights or one not doing as well as the others.
Because of rack space I do 2 per 6 quart bin until they're 15 grams; then they get their own. However, I would prefer to raise ALL of my geckos separately... If fed adequately they will grow as fast as those housed individually...
Interestingly, in my experience, hatchlings from single egg clutches that are housed alone seem to be less "on edge" than clutch mates that are kept together...
All separate to avoid tail nips and fighting.. if you have the space.. but if anything I would agree with Michael. 2 per shoebox and then at 15 grams of on their own home..