You need an answer you can forward the same day.
You manage a portfolio of client sites: unrelated domains, different CMS setups, different contracts. One of those clients is an EU company, or a public-sector body. Their DPO or procurement team writes in.
They are not asking whether you take privacy seriously. They want a data map, a DPA they can file, and a subprocessor list they can read without an NDA. A checkbox on a pricing page does not survive that review.
With Oh Dear, GDPR applies by default, not through an adequacy decision or a framework, because the company is Belgian. The Data Processing Agreement and the subprocessor list are public pages. That is the pack you send.
The tools that run Oh Dear are mostly European too: hosting at Combell (Belgium), performance metrics in ClickHouse Cloud's EU region, error tracking by Flare (Belgium), newsletters via Mailcoach (Belgium). US subprocessors are on the same public list.
You still need website uptime monitoring on those client sites. GDPR uptime monitoring is that same job, with a vendor who will name where the monitoring data lives.