I have a Kia guard in my 'Mk 2' and it does allow the use of the load area cover. It also allows the rear seats to recline to the first position and is half height so that long items can still be loaded with the rear seat (s) folded and the guard in postion. It's not perfect....the foot plates used to slide forward until I modified them with a nut & bolt that slots in to the retaining socket in the car...and the top bar on the guard appears in the rear view mirror just at the point where I would want to be seeing the idiot doing 100 MPH catching me up on the motorway.....it does contain the dogs though unlike other guards I've had in other cars which our whippet cross could wiggle around so that she could enjoy the front seats when left in the car.
i have used travall for my last few cars. They are excellent quality and completely custom fit. You dont loose any boot space with silly legs going down to the floor.
Mine took me about 15 mins to fit. There is a slot for the middle seat belt to extend down from the roof too. They fit into the slots for the boot cover and onto the brackets that the rear seat secure too.
In my opinion far better than any others i have seen.