Housing for pregnant females?

I'm wondering if anyone has any suggestions on hidey houses I can give to my pregnant females. I'm afraid to use wooden houses because I don't want babies to be crushed if the mom jumps around and flips the house. It just seems too dangerous. And with the fleece houses, they tear them apart in a week or two. I've spent so much money on fleece houses just to have to toss them after about a month :hair: Does anyone have any suggestions on what I can give them? I feel so bad having them in a boring empty cage, but don't know what else to give them.