You're tasked with establishing Service Level Objectives (SLOs) for a high-traffic multi-region web application. Customers expect consistent availability and swift response times, and they currently express satisfaction with the application's performance and availability. Upon analyzing current metrics, you find that the 90th percentile of latency is 120ms, and the 95th percentile is 275ms over a 28-day period. What latency SLO should you propose for publication?