where to put rack

I like to put the rack at the bass null along the sidewall to minimize airborne vibrations transmitted to the sensitive equipment. But if you have to put it in between, try to put it as far back against the front wall as possible. And if possible, choose a short rack such that the top shlef is below the mid-range driver.

you mean behind the speakers,,unfortunatly my rack is 4 feet high & my suspentionless T/T sits on the top shelf.

....a question rife with double entendre possibilites, but I shan't go there.

I don't know much flexibility you have in terms of positioning the rack. But if you have a TT then you definitely want to look for the bass null. You can walk around the room while playing bass heavy music and try to find the spot at the TT height where the bass disappears.