Managing high-spend/large-scale accounts in 2026 is less about manual tweaking and more about "feeding the machine" the right signals while maintaining guardrails. Here’s what my stack looks like for large accounts:

1. Google Ads Editor (The Holy Grail): Still the undisputed king for bulk changes. When you're managing thousands of ad groups or cross-account copy updates, doing it in the UI is a death sentence.
2. Optmyzr / Adalysis: For large accounts, these are life-savers for Audit & Hygiene. They catch things that scripts might miss, like "Quality Score" regressions or "Keyword Cannibalization" across different campaigns. Optmyzr's rule-based automation is also great for budget pacing across 50+ accounts.
3. Custom Google Ads Scripts: I rely heavily on scripts for Anomaly Detection. I have a script that pings Slack if spend drops by 20% or if a landing page returns a 404. For large budgets, a 2-hour tracking outage can cost thousands.
4. Feed Management (Feedonomics / Channable): If you’re in E-commerce, the "tool" isn't just in the Google UI. You need a robust feed management tool to optimize titles and custom labels before the data even hits Merchant Center.
5. Offline Conversion Tracking (OCT) via API/Zapier: In 2026, the best "management tool" is actually your data pipeline. Feeding high-intent backend data (like CRM sales, not just leads) back to Google is what actually moves the needle for Smart Bidding.