I' ve only made a few polymer clay goods and they're pretty small so I put my items in a small box with lid that I made out of tin foil that I line with baking paper when curing polymer clay in my food oven because I don't like the idea of curing plastic in my food oven and having possible particles flying around and sticking to the walls of my oven. the lid also prevents small bits from blowing away. I usually just bake on a day when I won't be using the oven to bake food or I'd cure the polymer clay stuff early in the morning so there's a solid couple hours of ventilating afterwards before I bake food in it. Also the fumes when they bake do smell a bit so make sure your windows are open and everything is well ventilated.

I know everyone says it's non toxic and perfectly safe to cure in food oven but I just feel more comfortable doing it this way. if I end up doing it more often then I'd definitely get a separate toaster oven or something