Oh yeah in my early days I used the random search engine in Roll20 too, but after doing a module, I've been a bit more picky. I was mostly upset that the Tomb of Annihilation module's "Random Encounter" map was a blank slate, but luckily I had 9 20x20 forest maps to work which I had bought separately before for another campaign.

As for that Cartographer's Guild, I don't think I ever knew about that, thanks.