Agree - whatever works!Hmmmmmm I have mine set up vertical & they are getting plenty of water ......... bottom line is *I think* as long as they are getting enough clean water it really doesn’t matter which method you use .
Sorry, I didn't mean to imply that vertical nipples are not any good as I have never used them and I know they work for lots of people. I was just saying that the instruction to have them high up I believe comes from the use of vertical nipples. Most instructions on horizontal nipples are not to put them too high.