If you already have the ancestors on WikiTree, then it seems the question is whether you can mark them as confirmed by DNA. WT has specific rules for that. (I'll go find the link in a minute.)
Often, DNA matches that appear to go back to very early generations, such as American colonists, can't be verified because they could have come from many different ancestors. (If the match appears to confirm a seventh great grandfather, for example, are you sure you don't share other seventh great grandfathers, as yet unidentified, with that match?)
If you can't satisfy WT's rules for DNA confirmation, you can still add a "DNA information" statement to an ancestor profile. I've done that. But please be sure to clearly state the match strengths.