Revmob Unity SDK - How to make banner ads stay in portrait mode?

I am working on a Unity game for iOS and have banner ads that I implemented using revmob’s Unity SDK. The game is exclusively in portrait mode, but the ads right now seem to move and stretch to the bottom of landscape screenview when the device is tilted. Is there any way to lock the position of the ads so that they only appear in portrait, and don’t move?

ugh, I’m dying for an answer on this. It’s so annoying.