Howdy and welcome aboard CF Aly!
First, getting a life raft and it's possible use is a debatable topic. Some won't sail offshore without one, while others scoff at them. So, opinions will differ and you should expect opinions to be simply that.
My opinion? If I were going around the world this year I would pick this (6 person, hard case, self righting, inflatable
Viking RescYou PRO ISO/ISAF Life Raft
If it did not fit in the Oceanus 45 designated spot, I would mount it on the stern in a special cradle
with a quick release and a safety
knife mounted nearby or on the case.
You can also find many threads here on CF which discuss different aspects of Life Raft designs, choices, age, maintenance
, use, etc. here is a list of previous discussions on the topic.