Like @Dulki, @Goblinounours, @HOST, @boundmore and @majorvex already have suggested (and explained) in their posts its usually done as a “zone” option under one or more characters (characters to maximize FF genaration).
Splitting up a big area also increases you settlement prestige when you use a certain block a lot in more beacons then when you use it in one (talking Multiple Smart Stacks of the same material).
For example area under 1 beacon has 1 mil prestige and split up under 2 beacons the combined prestige is 1,5mil prestige.
I do have to have to point out 2 things.
It’s perfectly fine if you plot the full terrain first and replot under an other beacon in the area you are “going to build” and set it as a zone.
If you don’t have Gleam club or don’t plan on extended it later on keep in mind multiple beacon is harder to keep track of when you have to manually fuel them. And planning to combine the other beacons to a single beacon after the fact can be a nightmare because of how it was plotted in the first place or potentially missing a few plots and have areas regenerate because of it.
(Im not the only that has had replot misfortunes over these past years )
To point out once more if you want to plot it all under 1 beacon it is your choice certainly less to keep track of if you don’t have Gleam Club.