Hi @ Jose L.
As documentation says:
Personally I would recommend all new Dynatrace Customers purchase the Dynatrace One Package as it provides you with all the resources needed to stand up your instances and support you in any issues you may encounter. You also get a access to live chat support as well as have coaching sessions with a Dynatrace expert on a frequency level you decide. Dynatrace One is hands down, the best support package ive worked with.
With that being said, I have seen issues where RUM/Session Replay and so on have had issues with monitoring very old platforms. But what that being said, its very very easy to shutdown those parts of the oneagent. So in the event you deploy and see an issue, you can respond quickly by disabling the services. And thats where the Dynatrace One Support comes in handy as they will assist you on those issues and setting everything up.