74 Clear Silicone Bumpers & Wall Protectors – 5‑Shape Self‑Adhesive Pads for Cabinets, Doors, Drawers & Furniture – Noise Dampening & Surface Protection by Vellax

Since you’re already spraying inside maybe you can add little clear furniture stickers (like these https://a.co/d/0aVyMK0i ) to the side walls? They’d work like footholds and look reminiscent of water droplets.