Installing WP twice in same Directory?

I have a website that has WordPress installed in the root directory /

I have another website, that’s contents is within that root directory, /seperatesite/ that stores a separate, small, splash page type website, with a separate domain pointing to it.

I want to setup another WordPress install inside of this folder. Is it hazardous to have two WordPress installs setup this way? I’m wondering as I currently don’t have the host credentials to create a separate database within the host area if need be, is this simple enough to move without this – or still a sensitive setup?

Thanks for any pointers!

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