where to put rack

Given the three options listed, you would want to tuck it behind the speakers but not all the way up against the wall. Unless you have dipoles, bipoles or other speakers that radiate out of anything but the front, this will reduce the amount of direct energy fed into the rack and minimize "damage" to the soundstage and imaging. Pulling it slightly off the wall will minimize the impact of low frequency reinforcement that occurs naturally in every room.

You may be able to walk in that area while the system is playing a find a spot that has the least "boom" and place the rack there. It is quite possible that this location might be off-center between the speakers, as this will vary with room dimensions and speaker placement. So long as you have enough speaker / power cord lengths to reach, i would try to use that spot.

If such a set-up leaves you with a noticeable amount of extra speaker cable on the short side, do you best to spread it out. DO NOT coil or loop it up. Doing such could create a randomly tuned choke and / or increase the systems susceptability to RFI. Sean
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Sean's right, don't expect to find a bass null close to the wall boundry if you have conventional box speakers, even on the side (wasn't an option anyway, I know). If there seems to be no difference in bass energy anywhere within the area of possibility, then go ahead and center it to keep it furthest away from both speakers, except if one speaker is much closer to a corner than the other, in which case bias the rack away from the corner. In all cases, get the rack as much behind the plane of the speakers as you can for the sake of imaging and soundstaging, while still trying to leave a gap of at least a few inches to a foot between it and the wall behind to avoid the strongest bass reinforcement. Then look into an isolation shelf for your TT. Happy listening! :-)

thanks for the help guys,time to get longer interconnects ..