For those looking for something like this. I bought a couple of these for road and mtb. Works great. Uses the watch strap to hold it in place. I'm not recommending this particular one, there are plenty of the same design on amazon. This was, at the time of my purchase, simply the cheapest option.
https://www.amazon.com/gp/product/B07JVKH3BT/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Edit: Didn't fully make this switch until I bought a chest heart rate monitor, but if you are doing the above, that won't hold you back. Keeps the watch right in front of your eyes.