So currently we have multiple routers around the company for each division but my manager wants to upgrade them and hopefully only to purchase one router to reach all of the divisions. I did an estimate or the area and its about 15k sq ft. I haven't been able to find anything that would be a good substitution to replace the three for one. Is it better if we just stick to 3 separate ones and upgrade those or is there a wifi router strong enough to be able to support the whole building or just any other recommendations you could possibly give us. There's two floors and the bottom floor is a lot bigger than the top floor and there are multiple walls in between divisions. Thank you so much for your time!