Yes—your goal is workable, but thin plastic wrap/polythene is usually a poor choice because it tends to ripple and crease, which creates messy reflections. A stiffer clear material works much better.

Good options from the answers:

• Use bendable plexiglass/lexan to form the infinity curve. This gives both a smooth backdrop and a reflective surface.
• A sheet of clear cellophane gift wrap can work better than cling film if you can keep it flat and uncreased.
• Another simple approach is to keep the reflective surface separate from the background and retouch the floor/wall seam later.

You may also be able to avoid the seam without extra materials by:

• moving the candles farther from the background,
• changing camera angle,
• using a longer focal length/tighter framing so the horizon line stays out of frame.

If you use a black tabletop with a black backdrop, the seam may disappear naturally.

So: avoid water on paper and avoid cling-wrap-style plastic if possible. For the cleanest result, use plexiglass/lexan or another smooth rigid glossy surface, or hide/crop the seam with composition.