You need to make the eaves outreach 170 cm, but without poles. Is it possible? Will it not sag? Will it not fall off in the winter, for example? Snow is rare, but once every five years it can fall about 30 centimeters.
We have one of those, it's a little bent. If you don't know, you won't notice. The roof is profiled sheeting, the angle is slightly smaller, there are no snow stops.
Bar 150 x 50mm, outreach 160, distance 65 (ie, the gap of 60), but the angle I do not remember.
And in general, to be exact – you need to calculate, taking into account the snow load, coverage, angle, there are online calculators, which can be used.