You don't necessarily have to solve this by modifying the original maps. You can, for example, look for maps on specialized Heroes websites. I suggest starting with heroes.ag.ru and all4heroes.net

I didn't know about "all4heroes," thanks... )
As an option, perhaps, but all the fan-made maps I've played... how to put it... Well, they are either too specialized or too "rough."

As for the default maps, I'm not an expert in editing and digging through archives; wait for advice from other players.

I found a file in the "data" folder - data.pak. It opens with any archiver. There's a "Maps" folder inside it. I extracted it... And what do we see? There are several more folders inside, such as "Scenario," "Multiplayer," "Singleplayer," etc... I was already getting excited, but no...
In these folders, there are even more folders, with code names like A1L1, A2M1, and so on... I assume this is some kind of alternative name for the maps...
Well, and inside these folders, there's a bunch of files in xdb, bin, lua, and dds formats...
That's where I got stuck... Apparently, these are the components that make up a complete map, but how do you convert them into a file that can be read by the editor? Does anyone know about this?

P.S.: Maybe there are some mods that would allow you to choose the "alignment" of a map at will? (like in Warlords, for example)
Or some modifications to the random map generator where you could specify this function?