Check if model is not in the space or intertwining with another model

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Something like this may work (I marked where some code would run if an overlap occured with the warn())

for _, Model in ipairs(TREES) do
    local Params = OverlapParams.new()
    Params.FilterDescendantsInstances = {Model}
    Params.FilterType = Enum.RaycastFilterType.Exclude
    for _, Part in ipairs(Model:GetChildren()) do -- edit: Made it 'do', not 'end'
        if #workspace:GetPartsInPart(Part, Params) > 0 then
            warn("OVERLAP")
        end
    end
end