These days there is a lot about ergonomics like standing desks (actually not that healthy without a treadmill) or vertical mice, which are in fact quite nice. So why not a vertical trackpad? Searching the web gives you only this from 2014.

Let's do it yourself, a bit of plywood, some nails and glue are enough. 

Vertical Magic Trackpads

While the trackpads aren't really vertical, they keep your wrist, lower-arm and shoulder in a much more natural position, it's really nice and comfortable together with the (black) gel pads.

The only problem is that the trackpads are rotated, so the X / Y axis are swapped. Luckily we develop the Magic Utilities and this was an easy fix, there are new options to swap and flip the trackpads X / Y axis in Settings > Advanced settings since version 3.0.8.1, downloads are here.

If you prefer an USB connection for the trackpad(s), there are various right angle Lighting to USB cables available.

Vertical Magic Trackpads

Have a break and fun with some woodwork.