We find postal tubes or long postal boxes are good barriers to stop beardies from crawling under furnature. Can block door ways with a long postal boxes (as long as they are about 10" tall laid on their side) , this way you can have door open and the doorway blocked, no risk of someone forgetting there is a lizard on the floor who could very easily curled up next to the door, or trying to look under it (who will he injured by an door being swung open against them).
No mouth sized toys , or bits and pieces on the floor , inquisitive young beardies are apt to try to eat them (esp if brightly coloured).
We only have lizards as pets, but if you have other animals as pets, (cats especially, and dogs) best to not let them be out on the floor when the other animals are present.
We never let two beardies share the floor together , but we do let a beardie and bluetongue share the floor on a regular basis buddy style. Both as adults are very similar size and neither sees the other as food, or a compedator .... (we found this out by careful trialing , more often than not the BTS and the beardie will pretty much ignore each other).