Fruit Trees, Early frosts, and Microclimates

Hi everyone,

Would a south facing rock terrace area (where the heat and thermal mass may prevent blossoms from freezing altogether) be better for delicate fruit blossoms or would a north facing slope (that stays cooler for longer resulting in blossoms showing up later in the year) be better for ensuring fruit in an area with late spring frosts?

I’m getting started on a food forest in zone 5 high desert and wondering about placement of fruit trees within microclimates and the impact on blooming and fruiting. In my area, fruit trees like peaches are inconsistent producers because of the erratic spring weather where you get warm spells triggering blooming before a hard frost that kills all the blossoms. It’s common knowledge here that you should get late blooming varieties but how can microclimates play a role here?

Also, when it comes to selecting trees between these 2 microclimates, it seems counterintuitive but would you put the cold hardier trees in the southern microclimate so that if there is a late frost while in bloom the blooms are tougher?

Thanks!