One big issue with stacking involves components with torroidal transformers inside. Those are the round donought things. Picture this and you'll understand:
A torroidal projects through the hole in its middle. Kind of like a javeline top and bottom through the hole, for quite a good distance actually. If the torroidal is lying flat, then anything stacked above or below it has this javeline like electro-magnetic projectile shooting through it.
Shielding helps, but doesn't necessarily get rid of all of it.
Enjoy,
Bob
A torroidal projects through the hole in its middle. Kind of like a javeline top and bottom through the hole, for quite a good distance actually. If the torroidal is lying flat, then anything stacked above or below it has this javeline like electro-magnetic projectile shooting through it.
Shielding helps, but doesn't necessarily get rid of all of it.
Enjoy,
Bob