Hi,

I'm looking for a plugin that removes any item if a foundation is placed on top, specifically stashes. The current bunch of plugins that i've found allow anyone to run around and attempt to place items on top to find out where stashes are placed. 

Do you tryed https://umod.org/plugins/stash-blocker ?

I did indeed, it just gives a warning that you're too close to a stash. Problem with that and the other plugins, they basically tell you where stashes are if you run around trying to place foundations