Songbird Essentials SE6002 Dr Jb's Clean Feeder, Red, 16-Ounce

I bought 3 of these. One keeps leaking drops of nectar underneath. Bees found it but hummingbirds don't use it now. Any suggestions?

Where is this made?

Can this feeder be mounted flat on a railing & if so, how?

Se 6002 vs. 16cly do both accomodate the larger 32 oz and 64 oz. bottles? are tops glued on?? what's the differences? too many ??? ?