Yes - 1 dead spot on both rails would work fine - but probably better to avoid the exact mid point for two reasons:
1/ this is precisely the location of the flexible copper tracks which interconnect the three pairs of rails on the underside.
2/ this is precisely the location of a set of rail retension tabs.
Therefore, moving the positioning of the deadspot away from the centre line by a least a couple of cm (along the direction of travel) would produce a more reliable result.
I still favour the modification to add just one additional dead spot on a single rail as per my above post... idea being to lift the rail, then cut, then replace... i’ll see if i can share some images to help clarify...