The one I have fitted is a Swan neck and fits in the existing gap under the bumper between the two fixing screws, it has dual electrics.
If you go for the dual electric version with the removable bar you have to remove about a 3" x 4" piece of the underside of the bumper on each side of the existing opening to accommodate the release mechanism etc and that leaves a fairly narrow strip of plastic going to each fixing screw.
As shown in this pic
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