It seems that doves are rather careless about nests, and nesting site, and because of that will have a few clutches of eggs over the warmer months. A neighbor of mine had an odd shelf on an outside wall (had been used previously for something, but I can't remember what), and every year a pair of doves nested there - that was probably one of the better spots, as I don't think cats could get at it. But no matter where they nest, there is risk from predatory birds - crows especially go for the eggs.
You could try a hanging basket. I've gotten dove nests in hanging plants.
Of course, in my area, we have mourning doves - so, different species, but perhaps they have similar habits