Bed Rail for Toddlers & Infants –... https://www.amazon.com/dp/B07S3XRRKW?ref=ppx_pop_mob_ap_share
I got three. There are gaps in the corners, but that’s how I get in and out without having to put the whole rail down, and I prop pillows up when I leave. They won’t keep her from jumping out of bed if she really wants to, but so far they’ve kept her from crawling or falling out in the amount of time it takes for me to get upstairs when I see her wake up on the monitor.