2022 migration from SRS 3.x to SCG 5.x

Performing due diligence prior to migration from SRS 3.x to SCG 5.x. I have the dell provided guidance. It looks like this is a fairly new category started in September of last year...

We currently have more than a few SRS gateways. Any capacity planning suggestions, gotchas or warnings from the user base?

For that matter any guidance from the DELL SMEs beyond the docs?