The localiser system provides the pilot with position information relative to the extended centerline. It tells the pilot if they are on, left or right of the extended centerline.
If the aircraft is left of the centerline and performs a loop over a point on the ground the indication of position relative to the extended centerline will not vary - nor will the indication.
Similarly the Glideslope provides the pilot with position information relative to an imaginary surface starting at the touchdown point and set as thre approach angle.
If the aircraft is above the glideslope and performs a slow roll then the glideslope indication will not move - nor will the indication.
The important thing to remember here is that we are talking about a pilot interpreted aid to navigation.
The indications always say the same thing - upright or inverted since the position of the aircraft relative to the centerline and approach slope have not changed and therefore the way that the aircraft (as an object) has to travel to regain the centerline (which is a vertical plane) and/or glideslope (which is a plane set at a specific angle) has not changed.
As in other aspects of inverted flight, if one imagines onself sitting upright on the underside of the aircraft and moves the controls appropriately, then imagine what that would happen with the end of the stick and rudder pedals you are holding while hanging upside down.
Regards,
DFC