Alongside pear patio trees which do OK.
I think both of these articles will help with your fruit drop problem:
I had blossom this year after 3 years but no fruit
This article should answer your questions:
Is it correct that you don't have to water my cherry and pear trees that are in patio pots during the winter, and should I wrap them up
If you go for more than a couple weeks without precipitation, I would water them. You shouldn't need to wrap them unless you have sustained temperatures below freezing.