When you push the parking brake without frame connectors the cable is very tight to the floor, it rubs so my undercoating wears off in places. Now, in my case, with the frame connectors installed the cable will have some verikal tension when the brake is engaged, since the tube is about 1/2 from the floorpan. It will rub on the edges of the tube a bit, but it's no big deal, about equal to the original touching on the floor pans.
It's not a great solution for a parking brake to start with, very crude construction, but it works.