In a workstation or work cell with 5 operators working face to face, do we still need plastic barriers at the middle even if mask is already mandated?

We cannot rely only one type of control, i.e. Masks. Factoring in the hierarchy of controls, a combination of controls are encouraged. We all know masks are not 100% effective, thus having other controls such as barriers, hygiene protocols, in combination of masks can create a bigger impact in reducing the risk of transmission. Carry out a risk assessment for this scenario, and determine what other controls are warranted.