Kitchen countertops are glued or screwed into place. In those cases,
there wouldn't be enough play for anything to warp or cup much. As
well, most laminated countertops are are commercially made, at a guess
in a fairly controlled environment.

Your applying veneer to a tabletop while veneering only one side is
courting disaster, especially considering it's only 1/2" thick. But,
it's your choice how you proceed.