ViewSonic - VA1655

The Surface devices can deal with secondary displays with different aspect ratios just fine. I like the [Viewsonic VA1655 portable display](https://www.amazon.com/gp/product/B09237LL5Q/) for a lot of reasons. Good image and only $100 on Amazon. It has a built-in stand that supports Portrait AND Landscape orientation. It has both a mini HDMI jack, and it works great via USB-C Alt-Display Port mode, so you only need one cable to both connect the video signal and to provide power. It has two USB jacks, so you could also run a power adapter to the display, and then that single USB-C cable will send power to the computer. It's also pretty well built and lightweight. I don't even bother using it's little padded sleeve when it is in my computer bag. When I expect to be doing a lot of portable work at a desk, then I also bring a folding "floating" display stand: https://www.amazon.com/gp/product/B0BTDHQJ6X/ . This allows me to put the Viewsonic "above" my laptop display for a vertical twin display setup. I get a lot of inquiries about how I am doing this when people see it. It's VERY productive.

This. I've got two. Use them with 15.6" Viewsonics. They're very stable, very configurable, very light, and very compact. And I like them very much.