Hi bihai,
That weather must have been pretty bad to do that kind of tree damage.
Glad tho,that the greenhouse was spared.
As for the pineapple,were it me,I think I'd try both ways.
First,root the top group as is,what a spactacular multiple plant that would be.
And when too big,then root the individuals as you see fit.
The bottom pups,I'd root seperately.
But thats just me,I'm sure whatever you decide,or other
GW'ers will suggest will do well for you.
I'm sure there are many pinapple experts out there with some good ideas.
Bob

I myself would treat the pups like Vriesea offsets, cutting them off at an angle.

Well when I get a pineapple from Publix, I twist off the top, remove a few of the botton petals/leaves (sorry the terminology escapes me) and then I set it in a light mix Promix or maybe even sphagnum. Sometimes you can see little roots. If I need to prop it up with sticks I do. Each one is done individually. Of course this is regular pineapple, I don't know if yours would work this way. I don't ever root anything in water-ever.
Barb

I never water root anything either. I didn't twist this off the stem, I cut it off and left a bit of the pineapple top on, will that rot?

With my regular pineapples, I take that off too.

I'm no pineapple expert, but Bob's suggestion makes sense IMO. I'm sure I've read discussions on different methods of rooting pineapple tops on here before, so just search the forum for "pineapple" and you should find some old threads with suggestions on how you should tackle it.