And yes -- slanting the keyboard that way is usually called keyboard tenting. Also highly recommended, but difficult to implement in practice because it requires an even lower base for the keyboard, and there aren't many good accessories out there for it, sadly...
I'm still waiting for someone to sell a cheap kit for angling keyboards downwards and implementing tenting. It's kind of complex to do both at once...
Been toying with the idea of getting something 3d-printed, basically something just as high as a Macbook, that you can attach to the front of it, giving a flush surface. Even better would be carving a Macbook-bottom-shaped or external keyboard-shaped "recess" into a table to place it into.
Ever seen or heard of anything like this?
The downside is that you really need to get your desk way low for your arms to naturally "droop" down over that. I have a motorized sit-stand desk I bought specifically after comparing specs on how low the desk surface can go, and the position that's low enough while seated is basically as low as my knees will let it go. A separate keyboard tray would be great but they rarely have room for the footprint and height of a tented keyboard with a touchpad in the middle.
Standing up, it's a lot easier to find a good height.
I want to be able to buy them as an adhesive add-on for any (split) keyboard!