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I spent a dozen or so years in the tire biz. Here's my take on the situation.
First, I'd need to see the tires to be sure, but if you have an undulation in the sidewall of the tire only it's probably no problem. Tire casings get slightly larger with use--The heat expands and stretches the rubber. Just like a rubberband, it never contracts back to it's original shape 100%. A radial valley--pointing from bead to tread-- is where the seam is and there is more rubber there, so it stretches less. A normal condition especially on older tires.
Second, new tires on FWD should always go on the front. All of your steering, all of your acceleration traction, and up to 80% of your braking come from the front. Of course they wear faster up there, they do all of the work! If you want to take real good care of your tires, rotate them regularly, they will give you more miles--as a set of 4. Regular rotation also gets you an inspection of brakes, shocks, struts, springs, exhaust--a good way to head off problems. If you need rear traction, get snow tires.
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