Redis Labs (the official sponsor of Redis now) uses a custom proxy layer on top of Redis, giving you the latest 4.0 version with support for modules, no downtime and features like storing the values of keys on SSDs. They also support cross-region multi-master using CRDTs.
If you need VPC/internal access only, or are fine with the lower level of features, or just want to consolidate on GCP services, then Cloud Memorystore can work, but otherwise I'd recommend Redis Labs.
Unfortunately redis labs isn’t available in all regions of GCloud. I was effectively begging them to add support in Europe a couple of months ago.
same here for India datacenter of AWS or GCloud
It is in your GCP account, and thus VPC. Has a private ip address.