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You can set up a cluster of proxies wherever it makes sense for you. It could be in a single zone, across multiple geo zones, etc. The key ingredients here are: 1. Your proxies need a way to share state irrespective of their cluster or zone. We provide this out of the box by letting you connect to a central Redis store (or cluster), which is responsible for holding a common state. Each proxy will update its own ephemeral in-mem store to match your central Redis. The intra-proxy sync is handled automatically via Redis pub/sub. 2. You need to point GrowthBook's

PROXY_HOST_PUBLIC

to a single proxy server URL. It doesn't really matter which one since all others will be synced via shared Redis.