Is this how to beat carrot fly!

I was lucky to get a small greenhouse frame from freecycle yesterday which is handy as it is somewhere to keep the brassica seedlings during the day.  I also thought that perhaps I could beat the carrot fly by putting my pot of winter sown carrots on the top shelf!

What do you think:

Hi, it's not when they are in that state you need to worry, it's when they are in the ground they're vulnerable.