I have had many components that had square, rubber feet on the bottom and haven't had any real issue with marking up the lower component from them. You could buy these feet (ones like them) @ home depot for pennies. They wil HELP, but do be advised, if you are going for absolute perfection...nothing but a rack will work! You could, and in this case should buy a cheap rack (Salamander's can usually be had for ~$120 and put the equipment on that for now, you can always sell it later for only a small loss.
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