ASUS ZenScreen Duo MB14FCD

Pros

• +Two 14-inch 1920x1200 (16:10) panels
• +Standalone folding design isn't tied to a specific laptop's lid geometry — outlives a laptop upgrade
• +Dual USB-C with power pass-through plus mini-HDMI covers most laptop and desktop setups
• +ASUS backs the ZenScreen line with a 3-year warranty per the listing

Cons

• −Buy box on this listing is a third-party seller (MBM Sales) rather than Amazon or ASUS directly
• −Heavier and bulkier to carry than the lid-mounted Duex extenders since it's a fully separate unit
• −$333 is the second-highest price in this shortlist