Hola James, Where can we meet? = ¿Dónde podemos encontrarnos? "Nos" se utiliza para "nosotros". "Los" se utiliza para "ellos".

¿Dónde podemos encontrarnos? That's the correct translation.

Because Dónde podemos encontrarlos, means where can we find or meet them? Encontrarnos is for We (nosotros)

Maybe I'm getting the wrong context, but I don't think that is a good translation. The version you have found says "where can we find them?". A more accurate translation for your sentence would be: ¿Dónde podemos quedar?