I have traditionally zeroed most of my calibers around -“ high at 100 with glass scopes. However, I mainly shoot very fast calibers.
With thermals, a consideration many don’t take into account is the fact many sit higher off bore. For instance, the Bering thermals mentioned typically sit about 2.5 inches off bore. This makes a significant change if you plug it into a ballistics chart. I actually zero my thermals somewhere between .25 and .5 inches high at 100. There are many people that will try to extend their range by zeroing a few inches high at 100 and end up missing a lot of animals in the sweet spot of their range because of the excessive height above bore.
My advice is plug your load information into a ballistics table and see what makes sense for you and then test it out at the most typical distances you are likely to shoot.