Vertically stacked bishops

It seems to me that the two bishops are more often stacked vertically than horizontally, i.e. adjacent on the same file rather than adjacent on the same rank. Is this intuition right and if so, is there any particular reason for this?

I would guess that it is true and that one reason is that it is generally more important to control/contest files than ranks. For example if white has their bishops on d2 and d3 they can guard every square on their side of the c and e files from invasion.

I find them hard to balance vertically

I guess most time the so called Horowitz bishops are not even close to each other, just some random placements on adjacent diagonals.

www.chess.com/blog/coolthing/horwitz-bishops-on-k-side

It doesn’t really matter in the majority of cases because the effect on the diagonal is important not the placement on it.

@BaronVonChickenpants : you're right; this technique takes years of experience and dedicated practice.
It's probably for this reason that mating with 2 rooks is so much easier and more popular than with 2 bishops or knight + bishop.