My Cherry Shrimp that are the lucky ones in their own private little 18L tank have live plants which they are always clambering over as well as half a coconut that they can hide in but usually just clean as well as a tall Greek type pillar ornament near the outlet of the casade filter that is on thier tank. They also have moss which ends up wrapping itself around the filter inlet so most of the babies don't end up doing for a 1 way ride. The Cherry shrimp really do seem to prefer having different heights in their tank to explore and clean and I often see a group of them on top of the pillar directly under the filter inflow. The cherries in this tank are always active and hunting around the tank and aren't even really afraid of my hand if I have to do anything in their tank.
I have some other cherry shrimp in one of my 4ft tanks that has an artifical rock wall that goes half the length of the tank, and those shrimp are almost always on that wall cleaning it. The wall is mostly reddy browns and the shrimp in that tank are a lovely deep red to help blend in. The shrimp in this tank are only increasing slowly as I strongly suspect the male fighter who shares this tank is scoffing the tiny babies.
I am sure you will love your cherry shrimp they are fascinating to watch.