I have a pair of the same holder racks on my boat except they screw in instead of go into a seat base. I mounted them on either side of the motor well and they work slick as snot. Great place to stand a large landing net too.
I don't have a picture at the moment. But the rod tube cluster is the same as on your "standard" picture except that it's just the cluster........no post. They mounted with screws on either side of my outboard well.