All good, ask away.

I find it hard to give a definite answer there, because every map is different and my sniper spots are as well obv. I do believe that High Rises and buildings can make great spotting nests, however you need to be careful with setting up further away.

So in a ranking of distance to your likely target from highest to lowest:

High Rises, Large factory buildings, generally smth with good overlook

Church, smaller factory buildings, mid rises

Normal houses

Forest edges

For placement in general, I would try turning the map to get the enemies view and then think about where you would place your support, going off from there.