All three varieties are single trees, grown as double oblique cordons on QC rootstocks.
Re. storage, I find the fruit boxes from Lidl's excellent. They even have ones with trays specifically for large pears. I've even been known to BUY pears from Lidl's when we have run out, as the imported Abbé Fetel variety they sell out of season is one of the nicest commercial varieties; similar to Concorde, it is far superior to the ancient cold-stored conference or imported green Barletts sold by all the other supermarkets. Abbé Fetel does need quite careful storage otherwise it can 'go over' very quickly; I keep mine in the fridge.