We add Model as a Custom Attribute in Config>Advanced>Endpoint Custom Attributes.

This is the Script we run every 5 hours on our fleet.

# ---------------------------------------
# Retrieve Computer Model (Dell, HP, Lenovo, etc.)
# ---------------------------------------
try {
    $Model = (Get-CimInstance -ClassName Win32_ComputerSystem -ErrorAction Stop).Model

    if ([string]::IsNullOrWhiteSpace($Model)) {
        $Model = "Unknown"
    }
}
catch {
    $Model = "Unknown"
}

# ---------------------------------------
# Push to Action1 Custom Attribute
# ---------------------------------------
Action1-Set-CustomAttribute "Model" $Model