I have no experience with this species of Puya, but have grown a few others over the years. I just looked this one up, and note that you may never see it bloom based on its normal reproductive cycle. According to the article I read, in habitat, they can take between 40 - 100 years to achieve maturity and bloom. It is a moncarpic species. You might get lucky, as they observed that one plant in the collection at UC Berkeley, here in northern California actually bloomed in a mere 28 years.
My two subspecies of Puya alpestris, which I have posted blooming in the past, have each bloomed once in the last 15 years. Give this one plenty of room. I assume it is like the other Puya's and is an extremely vicious plant up close... very tough to week around. Given the overall size your Puya raimondii will achieve, just make sure to give it sufficient space away from any walkways or areas you may need to access without donning full body armor. I look forward to seeing your specimen planted out! Good luck and keep this thread updated on the growth!