Should mobile timers be sticky?

As an e-commerce manager, I'm wrestling with how to implement countdown timers on mobile devices. The challenge is balancing visibility and user experience—I want customers to always see the timer without feeling overwhelmed or frustrated by intrusive design elements. Some timers disappear when scrolling, which defeats their urgency-creating purpose, but permanently sticky timers can feel annoying. I need a strategic approach that maintains user engagement while effectively communicating time-sensitive offers.