You need to have a quality agent represent you. Your offer will be for an unnamed party, which will raise doubts and suspicions. You agent will have to compensate for this with their credibility.
Another option is the offer made in the name of another party with the ability to assign the purchase & sale prior to closing. In either event, the benefit from staying anonymous needs to outweigh the risk of doing something out of the ordinary which can have risks associated with it.