The Search Input can be used for both starting a search query (the user is taken to a search results page after submitting keywords) and filtering (content on the page changes as keywords are entered).
Place the Search Input at the top of the content area the user can search. If it's the whole page, place it as high up as possible. If it's a list in a smaller container, place it above the list.
The placeholder text should imply what the Search Input will do, e.g. "Search in table", "Filter list", "Filter Tactics".
Conventionally, site-wide search inputs are displayed at the top right corner of an interface, but you don't have to follow this convention for SAP Engagement Cloud products: the Search Input can be aligned to the left.