Yeah,it is acceptable to use it.I used the those scheme in my 4-4-2 formation with Manchester United.Both of the DLP won't venture to far from their position. Ex : the DLP ( D ) will hold on to his default position,without any run from deep,so he could maintain the midfield position,the DLP ( S ) will sometimes running from deep,but it's not really often.
Hope my explanation could help you.