Stacked adverbs are provided in this article. The words listed here are commonly found along with the verb stacked in sentences. This reference page helps answer the question what are some adverbs that describe or modify the verb STACKED.
carefully, haphazardly
heavily, horizontally
neatly, vertically
Hope this word list had the stacked adverb you were looking for. In addition to adverbs used with stacked, other example verb adverb pairings can be found on this site.
You can help by adding more adverbs in the comments. Thanks.