にしたところで / としたところで

にしたところで means "even X": after a person or a group, it says that X is no exception to what follows, usually a limit or a failing. としたところで means "even supposing": after a clause in the plain form, or a noun, it grants a possibility and says it would change little. Both lead to a negative or dismissive conclusion.

The conclusion is often わけではない, せいぜい or a plain negative. Both forms belong to essays, editorials and argument. In conversation, にしても and としても say the same thing.

にしたところで or としたところで

にしたところで picks out who: the noun is a person or a group, and the point is that they are in the same position as everyone else. としたところで picks out what: the clause is a supposition, often opened with かりに仮に or たとえ.

たところで

The plain たところで follows the た-form of any verb and means "even if you do": it is a separate point. にしたところで and としたところで are that pattern built on する, with the noun or clause marked by に or と.