How to display multiple creatives within one Ad Unit from one Line item with Google DFP

I'm struggling with Google DFP. I can't figure out, how to show multiple creatives from one Ad unit. For example, I have sidebar_1 Ad unit, and I want to target here sidebar_1 house line item, and in this line item are five image creatives. I want to display all these five creatives and have this Ad unit responsive with his height to height of this creatives. See picture:

I would like to do it with Single asynchronous request and Safeframe containers.

Thank you for any suggestions!

I spent a lot of time to get answer to this question, and result is that it's not possible.

I came up with other solution, it's here as second solution Google DFP - Resize SafeFrame custom creative outer Iframe container from inside (expand ad). I will add there as many images as i want and iframe will expand/shrink to fit.