A: No, I would not. It is not treated in any way. Even treating it yourself I would not expect it to last more than a year or two tops. This is made for indoor use exclusively.
A: this board is not for outdoor use
A: Might be ok, I have used it outside for holding up some wire mesh for climbing plants, it greys but seems to hold up OK, I usually use this product indoors, for light plastic lattice material it might be OK. For outside use I would recommend pressure treated.
A: it would work but these are not treated wood, so you would need to treat them or paint them
A: I bought 18 8’ pieces
A: I used them outside, but I applied two coats of a penetrating oil based stain first. I will probably restrain them each year as well.
A: These are raw wood and haven't been treated for long-term outdoor use.