I considered it. But actually, the pad gives it some extra stickiness, and because I used painters’ tape to help keep the USB cables in place, it would be visible, unless placed it very carefully. And these Qi pads are so thin, the lip still provides rest/support for the phone, even with the rubber pad.
I will keep trying this and if the Qi pads shifting becomes an issue, i can use double sided tape or Sugru to secure them to the rubber pad.
EDIT: I re-read your post. I think i misunderstood at first. You mean put the Qi pads on the plastic, and then the rubber pad on top. It’s a thought, i’ll Look at it in the morning. Maybe. Esp if I can use painters tape to keep the Qi pads in place. Though then I’ll need to guess a little on where exactly to put the phones on the rubber pad. So, doing it the way I’m doing it gives a clearer “target”. And it might give better charge speed since the rubber pad would add some thickness between the phone and the Qi charger pad.