You can specify that all interfile links should go to the start of the target page rather than to the cross-reference anchor or HyperAnchor PI marker location. This is equivalent to setting NoRef for all paragraph styles in [HtmlStyles]; see §28.3.1 Forcing links to top-of-page for selected paragraph formats:
[HTMLOptions] ; NoLocations = No (default) ; or Yes (suppresses the part of all links after the filename) NoLocations = Yes
To remove all named anchors also:
[HTMLOptions] ; RemoveANames = No (default) ; or Yes (DITA, eliminate <a name=...> tags) RemoveANames = Yes