Still not sure what you mean by "protected range".
In LVP's aircraft will be vectored onto the ILS far enough apart to ensure the Localiser signal isn't affected for the aircraft behind, the same reason for airfields have "CAT 3" holds even though they may not have a CAT 3 system.
The ILS installation is flight checked for accuracy and signal strength out to 25nm. During a calibration the "protection" required is, generally, 5 nautical miles, i.e nothing between us and the installation when we reach a 5 mile final. That includes nothing taxiing in the Localiser Sensitive Area and nothing departing as an over-flight of the Localiser aerial causes the greatest "disturbance" to the beam.
The same level of protection is required regardless of the Category of the ILS.