Elevation elevation elevation. Once you get west of the ridge just west of Frostburg, where you increase to about 2000’+ you will do pretty good in terms of snowfall. Northern Garrett county along 68 from that ridge west of Frostburg west sees about 80” averages. But you will still notice a difference between the towns like Grantsville and the ridges.
If you really want to max out once you get to deep creek and south to Thomas/Davis along 219, you will notice a significant increase is snowfall over northern Garrett. This is due to higher base plateau elevation. That plateau maxes out down near Canaan WV where the valley floor is near 3,000’ with ridges just under 5,000’.
The trade off though is distance. The further away from 68 you go the more travel time you’re adding if you are coming across MD.
Lastly a lot of the snow out there is actually from lake enhanced upslope and clippers. If we’re in a cold pattern they can get a foot of snow from a clipper and the ensuing upslope flow behind it. But it’s not the same as a coastal. Many coastals only clip that area and the heavy precipitation stays further east. That doesn’t mean they cannot get coastals. They sometimes do and when we do get a east coast storm that takes an inside track they can get dumped. But those aren’t storms we typically think of as coastals since their big rain storms here and those don’t account for the majority of their snow. If you really just want to increase your chances of seeing a big nor’easter snowstorm getting a place in the eastern poconos PA or near highland lakes NJ might be better. Those places don’t get as much snow overall as Garrett (about 65” avg) but they get a lot more from pure coastals and can get crushed by nor’easters. You just have to decide what you’re looking for and what’s right for you. I don’t mind giving you some advice regarding likely climo as a specific location if you PM me.