Interesting question. Wondering the same. But after checking around the Internet -- no acclimation needed.
HOWEVER I did come across a rather clever way of adding them -- even for a small aquarium which is like the one I have. That is, add the pods down a (previously cleaned) PVC or acrylic pipe that touches the top of the substrate. Follow by rinses of the bottle(s) with aquarium water. This gets more pods to the substrate than those quickly lost in the water flow.
I also thought of, with a relatively newer setup, to follow down that same pipe, food for the pods (e.g., a live phytoplankton blend) also rinsing bottle(s) with tank water. I wonder if this last part is a good to fair idea.