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From a pure technical perspective, full range speakers should be 15' from anything; but, that isn't practical. Keeping speakers further from boundaries is more important in two channel rooms. In multi-channel applications, the speakers can be moved closer to walls; but, those walls need to be treated to avoid, among other things, the notch created by the boundary effect. The treatments need not be expensive.
PeterM is correct that the distance between the driver and the screen depends on the screen material.
Baffle mounting is another approach; but, without knowing the radiation characteristics of the speaker, it can be a bit dicey. Once in a built baffle, you're not going to move them a couple of inches (cm) one way or the other to snap the sound stage in place.
EDIT: The issues for the L/R are the same as for the center. The good news/bad news of this is the L/R are a different distance from the side walls than the center; but, again, doable.
Dennis Erskine CFI, CFII, MEI
Subject Matter Expert
Certified Home Theater Designer
CEDIA Board of Directors