Can I keep a trio

[Clementine_3]

I am personally against housing LEOS together in a single enclosure because usually at least 1 of them will try to establish dominance and stress out the others.

LEOS are solitary GECKOS and I strongly believe they have a better quality of life housed alone.

There, I fixed it.
I do actually think Leos are best by themselves. Sometimes groupings will work but you have to be prepared to split them up if things don't work out.
I also think a 20 long is the right size for a single Leo, not two or three...more geckos = much bigger tank IMO.