If your getting rock flowers, you should be fine if your parameters are within recommended ranges.
I keep many and they are far hardier than a lot of things we keep in this hobby. I move often and start tanks up in matter of just a few days and throw them in. My rock flowers have been with me for a while now, 3-4 years? Maybe even more.
They are far less likely to move if you give them a solid spot to sit in. Some folks use pvc end caps to let them settle in and then put them in the sand bed or where ever they please.
Most of the time, they will only move if water quality is poor, they are sick or they are infested with parasites.
I never had to worry too much about movement in this tank.