Fox, I would take scissors and cut the bands in the back removing about a quarter of and inch from them. So you would pretty much be removing the part in the back where they are glued together. Then they would lay flat much easier.
Really doesn't matter what you use to put them down... superglue works just fine. I would recommend using the kind that has the little brush inside.
The bands only have to stay still until the poly is poured. And a good tip for the poly (I mess with the stuff a lot
) Use a small gas torch to remove all the bubbles. You just sway it back and forth over the poured poly in a sweeping motion to remove the bubbles.
(The weight of CO2 removes the bubbles...not heat.)
Good luck!