bidirectional relationship

"... I would suggest, that we established a bidirectional relationship, you will send us client, who are interested in investments, we will send you clients, who are interested in legal services ..."

I think that the world that is mainly used is: взаимоотношения, but I was wondering whether we can also use двунаправленное отношение!

I would suggest
established a bidirectional relationship = организовать взаимовыгодный обмен

And, in my experience, двунаправленный is not suitable in colloquial speech. Too scientific. More likely, the adjectives взаимный, обоюдный will be in use.