Whether you use one monitor or multiple monitors, it is important to position them so that they are positioned in an ergonomically healthy position. And it is nice not to have to give up a lot of desktop space to accommodate them. That is why it is usually a good idea to invest in a monitor stand.
For years we have been using the LX Dual Side-By-Sid Arm by Ergotron (left photo). This is a well-built stand that has held up well over the years. While we have no complaints, at $300 it can cost as much or more than the monitors it supports.
Recently we purchased the Dual LCD Monitor Desk Mount Stand Heavy Duty from Vivo (right photo). The LX offers more articulation, but for our purposes the Vivo is sufficient. Because it only cost $50, we were not expecting such a heavy, well constructed, solid stand. We recommend it!