There is not possibilities let the user decide where to place the signature when using Docusign method call AddNewDocumentMultiSigners (when we need more than one signature).
With this method the only options we have are to send each X,Y positions otherwise an anchor system is possible.
But when we have multi signer like 5,6 or even 10 person to sign this is difficult to find the right place with those options.
And i know that is something exist on Docusign.