There is Lumo by Proton which says they have a focus on privacy. Here’s what it said about their servers locations:

Lumo’s backend runs on the same trusted infrastructure that powers all Proton services.

• Primary data‑center location: Switzerland – Proton’s core servers are hosted in secure, ISO‑27001‑certified facilities in the Geneva region. This gives Lumo the strong legal protection and privacy guarantees that come from Swiss jurisdiction.

• Additional redundancy: Proton also maintains secondary sites (including a U.S. location) that are used only for fail‑over and load‑balancing. These extra nodes never store permanent user data; they simply help keep the service available if the primary Swiss site experiences an outage.

Because Lumo is built on Proton’s existing architecture, it inherits the same end‑to‑end encryption, zero‑knowledge design, and strict data‑retention policies that apply to Proton Mail, Drive, VPN, and the rest of the suite. In short, Lumo’s servers are primarily Swiss‑based, with backup capacity in other regions for reliability, but all user data remains encrypted and under the protection of Swiss privacy law.