Lie long. Stand tall. ?
Are you asking short side up or long side up? The panel doesn't care.
The Junction box might, the instructions should say.
I mount them long side up. Makes for less material in the brackets. Maybe a little less leverage for the blowing wind.
I get asked that every week, like if its tipped the electric will pour out easier.
Mount them South facing, at about 10' steeper than your latitude. This will give a little less in summer, but a little more in winter when you need a little more.
For adjustable brackets. Spring and fall at your latatude X, winter X+10, summer X-10. I read adustable brackets, done everyday, will only increase the output for the year about 15%. I never figured it was worth adjustable brackets, and just throw another $100 at the panel, so it won't need adjusted 4 times a year(idiot-proof).
I'm not big on trackers until you have a BIG PV system. Expensive and breakable. I mean, if you are putting up 200w and a tracker, its cheaper and easier and more output to put up 300w fixed.
What you want is the biggest shadow from the PV. The bigger the shadow, the more sun it is catching. Close is good.
Hold you hand flat under a desk lamp, 12" up from the desk. Tip your hand both ways 15'. Not much change in the shadow. Now hold it verticial and tip it both ways 15'. Big change in the shadow. Thats degrees, not feet.
If it snows up there (lol), mount them where you can get the snow off with a broom.
A quarter inch of snow will shut them down. If they are on the roof of a 3 story house, nobody wants to go up in the snow to brush them off.
G-