Go on scopus website, click on search, select affiliation among the options, type in the affiliation name you are interested in, select the research area in the list, in the upper right corner of the results page, open the drop-down window named "sort on" and select "cited by (highest)". That's it.
I can find about highly cited and hot paper by my affiliation of Nutrition and Food Sciences research center in Scopus site by search and using the associated link
Go on scopus website, click on search, select affiliation among the options, type in the affiliation name you are interested in, select the research area in the list, in the upper right corner of the results page, open the drop-down window named "sort on" and select "cited by (highest)". That's it.