Just got myself the Logitech MX Keys, it's a great keyboard, but very low profile. Immediately began planning a riser that fits on the rear bar and lifts the back of the keyboard up to give what I feel is a more natural typing angle.

The bottom is rounded like the original base to give it flexibility for angle. You might want to add some grip if you use this on a smooth surface where it might let the keyboard slide.

Made it in 3 heights since I know everybody has they preferences. I printed SM and MD and found MD was my preference. I think LG would be too much for me without also finding a way to lift the front up a bit.

The pieces are measured to fit without any danger or forcing or scratching. You will likely need to add a little bit of tape (masking tape might be best, its what I used as shown) to the inside of this to get it to be a tight fit that lets you lift the keyboard and not have them fall off.