loosely speaking, I guess, I mean if concern for the passenger is not an issue, then you've eliminated the biggest drawback to this kind of install. it is very possible to gt an awesome sounding system using time delays to eqalize pathlengths even if the right speaker is 3 times the distance from you as the left. you usually will have to lower the gain for the closer speaker too slightly, this usually results in the passenger only really mainly hearing the speaker on there side, there imaging & staging can be real bad, but again, if that's not a concern then it's fine.
these are mostly generalizations, it's not impossible to get decent imaging on the passengers side too, adding this so I don't get yelled at by anyone
but much more difficult, there are other variables with each vehicle that come into play with this too of course, & reflections also come into play, but for the most part I'd say,if you want it to sound good to both front ocupants kicks are the way to go, if you only care abou the one sweet spot then dash can be awesome though...