The optimal angle of a solar panel in Canada is quite steep, 51 degrees latitude means 51 degrees solar angle. The big issue with snow is that people want these on their 3 degree off horizontal roof without access.
Now you can also go all the way to maximize winter sun, which is 16 degrees off vertical too. Snow is unlikely to accumulate for very long at that angle.
In many ways, if you have no trees or poles in the way, the way to do it is to hang it like a shingle, or ground mount. If you ask me, 45 degree angle is really nice, 22.5 degrees off vertical if you want more energy in winter.
If this Spaniard kept his panels, hes probably laughing right now.