just a suggestion that a whitelist would prob work better and easier

plugin indicates all entities that are "building" and you can add other entities you want to detect to the whitelist ("Additional prefabs"​)

thats the issue you dont want markers showing for blowing a pookie bear up or a bbq a whitelist would mean the user would need to add the item they want to set the raid marker off, it might also help on performance too
another idea
when a player takes a percentage of health from the building it says in chat "player has just started raiding in grid area x" or something along those lines

The plugin does not respond to broken doors.