[amsat-bb] Mount an Arrow on rotator with 2m vertical or horizontal

[Don Hoover (WS4E)]

Just wondering, should I mount my arrow with the 2m elements oriented
vertical or horizontal?

I am planning on putting it at 15deg and just using a az rotator.

Does it even matter which way its oriented since the polarity of the sats
are always changing?

Maybe I should mount it like this: / instead.

Just curious what some thought was the best way to go.