Location does matter... because I have found that wide perches are better protection against frostbite.Location doesn't make it more or less comfortable though. THAT was why I asked the OP if there was a reason. If their chickens prefer it narrow side up, that's fine. If they would prefer it wide side up, them being in FL has nothing to do with it.
However, the risk of frostbite in Florida is... impressively low.
And I know some people's birds do prefer the thinner perches... so...