If the speakers are a couple of inches in front of the rack, and are not excessively toed in (so that any sound waves going towards the rack are greatly attenuated) then I don't think you'll have any problem.
Also watch out for the side walls ... those primary reflection points on the side walls will kill imaging. Don't put the speakers overly far from the rack and end up with side walls too close.
All that said, I wouldn't buy a rack without a home demo. It would be like riveting your speakers to the floor before listening to them and hoping that you'd put them in the optimum place. Placement make more difference that the quality of the equipment itself in my experience.
Also watch out for the side walls ... those primary reflection points on the side walls will kill imaging. Don't put the speakers overly far from the rack and end up with side walls too close.
All that said, I wouldn't buy a rack without a home demo. It would be like riveting your speakers to the floor before listening to them and hoping that you'd put them in the optimum place. Placement make more difference that the quality of the equipment itself in my experience.