if you just want it to stop wiggling. lets see you said 1/2" to the carpet, carpet around 1/2" dep on the quality, your pad 3/8 to 5/8 avrg.
i would take a piece of hard wood maybe 1 1/2" sq. cut a slice in the carpet just enough to get the piece in. rounding off the corners will get you a smaller cutt. remove the pad in that spot. glue or fasten dep on wood or concrete floor, your pc in place. glue your carpet over the block clean out the hole and walla. you dont want that thing sticking up to much, there WILL be a day bothe doors are open and your gonna catch a toe