It's gotta be nice to see your polys from head to tail all the time.Rather than hiding.
It doesn't have to be bare. Think adding additional tall plants to fill it out more space would be fine. If driftwood is a must. I've found some large flat bottom pieces in the past where they can't establish a hide. Kinda like a stump with branches, or pieces that have a straight bottom cut. The emphasis of this 'bare' test is for the polys to be less territorial and aggression issues, and even swim around more right?