No. After many experiments in adhering to a wall, the best way by far is to use Command Strips. Using a sticky adhesive was problematic, and removed paint and really were not re-stickable. All walnut shapes come with Command Strips.

Yes. Command strips allow you to remove and restick, a few times. However, simply remove the Command Strip from the wall, while keeping the Command Strip on the walnut shape. No need to remove those. You will need a new Command Strip, and apply it to the one on the Shape. Your adhesive for the wall, will be a new Command Strip.

Yes, the Vinyl Shapes come with a removable sheet, and sticky adhesive back is below that.

Yes. Use something like a pair of tweezers, or a razor blade, to gently peel up the strip at a corner. Carefully peel off the removable vinyl from the wall, and re-stick it someplace else.

You can return the Walnut Shapes, and the Foam Core Shapes, but the Vinyl Shapes are not returnable, since once the sticky back is off, it can not be put back.