Hummingbird Feeder, Glass Hummingbird Feeder for Outdoors…

can it be used with just the plastic bottom without the metal part as regular feeder/decoration during winter?

How many ounces ?

Can I use it sitting on a table top or does it have to hang?

How to contact customer service for defective bottom of feeder? It corroded with in weeks of use. I don't see any where to contact anyone?