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> Is there any reason they should be vertical instead of facing the sun?

Takes up a smaller footprint of land, and PV panels themselves are now so cheap and last so long that it borderline makes sense as a fencing material even if you don't connect them to an inverter and power and anything with them.

Snow doesn’t accumulate on vertical panels. If it snows where you live this can make a big difference in winter performance and/or winter maintenance of clearing snow.

You get a different generation curve (more energy in mornings and evenings) with vertical bi-facial panels. Though this person is in a woody area which might not see that benefit.

That’s specifically for e/w bifacials, you don’t get that with N/S panels.

North/south bifacial shifts the generation seasonally, trading much less in summer for a bit more in winter when the sun is low.

Indeed.