From multiple manufacturer sources the important features are:

• Mounts designed for healthcare/medical environments (ICU, patient-bedside, OT) — not just consumer monitor arms. For example, the Highgrade ALW220 wall-mount arm is explicitly “for medical use”.

• Good articulation: tilt, swivel, height adjustment, extension/retraction so that the monitor can be positioned ergonomically and out of way. For example ALW220 supports monitors 15″-24″, up to 6.5 kg, with tilt –60° to +20° etc.
• Compatibility with medical monitors & VESA standards (typically 75×75 mm or 100×100 mm)