You're on the right track, just know the final X over points will be based more on what sounds good and blends best once installed. Getting the vocals to sound good is usually a big part of the equation, as it's like getting four people to all talk coherently all at once. One more reason not to have rears, as then it's six people all talking at once. If everything isn't dialed to blend just right (or close lol) you will get distractive distortion/ cancellation at the crossover point.
The explanation in the post above was just to give you a bearing on speaker selection. Not a guideline on setting points.
With that said, 1500 is pretty low for a tweeter, and you will get waaaay more output from the 6.5" mid in that range. I think my mids are at 2500, and tweets at 3200. The mids would play way higher (and still sound good) but they have a breakup node at 4K. Without individual eq for each speaker it's a no go for me. I'm not positive, but think your hu may have eq for each individual channel.
Put it this way, the mid is the workhorse. The tweets are just there to give a little sparkle on top. (The top couple octaves) Same with the sub, it's just there to fill the very bottom octave. Think how many octaves that leaves the mid playing.