It's easiest for laptops, since the laptop trays have adjustable angle.

If you need a desktop monitor, you can get an over-bed table and mount a small VESA mounting arm.

If you can spend 1k, the absolute best is to get a medical VESA arm and mount it to the wall. These can also have trays for keyboard and mouse.

https://products.multibrackets.com/en/wallmounts/flexarms-ve...