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You can obtain the rectangle with minAreaRect. Or you could also try Non-Maximum Suppression.

rects = []
for cnt in contours:   
    if cv2.contourArea(cnt) >= limit_area:
        x, y, w, h = cv2.boundingRect(cnt)
        rects.append((x, y))
        rects.append((x+w, y+h))

box = cv.minAreaRect(np.asarray(arr))
pts = cv.boxPoints(box) # 4 outer corners