Temporary fencing on a balcony?

I'm currently preparing to move into a new apartment that has a balcony. My cat loves being outdoors, and I'm lucky enough now to have an enclosed back porch. However, this apartment is on the 7th floor, I'm a little worried about letting my cat on the balcony and losing balance on the ledge.

I've already checked with the property managers, and we can NOT install any sort of protective netting or fencing, so I'm looking into temporary options. For example, zip-tying plastic fencing to PVC pipes that I could easily disassemble at the center and fold in half and reassemble as needed. And of course, there's always the option of a large cage for her to stay in, but that would be a last resort. We'd really like for her to have some freedom.

Thanks for any and all advice!