The supermarket I think you're referring to is Lidl. Should be okay but very occasionally they have the yellow jackets out (normally just the old firm and Hearts).
You should be better off here: https://www.google.com/maps/place/55°53'17.7"N+3°31'13.2"W/@55.8882428,-3.5208715,19z/data=!3m1!4b1!4m4!3m3!8m2!3d55.888242!4d-3.520323
Walk down the path and across the bridge and you're there at the away supporters end. Far quicker to get away after a five nil thrashing as well.