I like vertical nipples and have used them. However, they have issues. They are more likely to leak than horizontal nipples. They are also more likely to freeze than horizontal nipples. At what temperature would your vertical nipples freeze? My horizontal nipples were not frozen as low as -22 F.With my flock in Idaho, I used a bucket with vertical nipples and a bucket heater in the winter. I had a thermocube (link below) that would turn the heater on when it got cold, but didn't have it running all the time. When the temps were below zero, the vertical nipples would sometimes get stuck frozen and I'd have to loosen them, but that was only when it was very cold. I was very happy with the setup - it worked well with minimal hassle.
https://www.amazon.com/gp/product/B0006U2HD2