Are timers effective for high-value items?

I'm selling premium products with high price points and want to understand if countdown timers can genuinely drive conversions without seeming gimmicky or desperate. My concern is that luxury or high-value customers might perceive time-limited offers as cheap marketing tactics. I need concrete insights into whether urgency-based strategies work for expensive items, what psychological triggers are most effective, and how to implement timers that feel sophisticated and authentic rather than pushy or manipulative.