How annoying when renting prevents you from any proofing. Seems wrong 🤨
https://www.amazon.com/KidCo-Mesh-Rail-Guard-White/dp/B073TYLZCN
We had the same problem with the bannister and ended up zip tying (the kind that’s a foot long and 1/2 in wide and doesn’t rip easily) a section of a play yard to our bannisters.