The further away the WH is from the point of use, the larger the pipe run, whether there's any insulation on the piping, and whether it runs through unheated space all help to determine how long it takes to get hot water to the point of use...it could be quite a long time. You may be a candidate for a recirculation system.
Then, you want to determine how many hot water users are likely to be running at once, and for how long. Use the manufactuer's specs for flow. If you like long, hot showers, and others may be doing this while you are, that would change things. If you have a large soaking tub, that would change things. Do you do clothes in warm or hot water at times? So, it's not one size fits all. You also didn't indicate whether you wanted either an electric or gas fired water heater.
Then, if gas, what size flue? Would you be willing to vent out the side of the house, or must it go through the roof? Do you have room to put a WH on say each end of the house so one would be closer to the points of use? All of these things affect what kind, size, recovery rate, and applicability to your situation...no one size fits all. Then, it seems some codes have guidelines on what they expect, possibly based on the number of bathrooms.