Prius V camera housing rattle

The plastic housing covering the LKA camera at the top of the windshield is rattling a lot. If I apply some pressure to it, the rattle stops. The housing doesn't fit tightly against the windshield, so I can't lubricate the joint or use a thin shim to immobilize it. I did notice that if I shoved my finger in the gap between the housing and glass that the rattle stopped, so pulling the housing down a bit would work. I'm thinking I can find a thick clear rubber stick-on foot and apply it to the glass, wedging it between the glass and plastic. Anybody have any other good ideas?