ASUS ZenScreen 15.6” Portable Monitor for Laptop (MB169CK) - Dual USB-C, Mini-HDMI, Plug & Play External Screen for Travel Dual Setup, Full HD, IPS, Anti-Glare Surface, 360° Kickstand, 3yr Warranty

I also recently had to squeeze into a smaller space. I ended up ditching my full-size second monitor and putting in a portable monitor, centered below my main one. Not sure if purchase links are allowed, but something like this: https://a.co/d/0cucdums