I installed a Simpson Lawrence roller to hold my 25 lb CQR by the same company. There is Windline, that also makes a roller for the plow anchors, too. The SL roller is long enough so that two of the three 3/8" bolts mount aft of the "toerail." The forward bolt goes right through the toerail. The body of the roller sits directly on the toerail, and I built up a pad of epoxy/high strength additive behind the toerail for the rear of the body to rest on so it is in plane with the top surface of the toerail and the deck. I mounted on the port side of the stem fitting. My hawse pipe is to starboard. I had to move the port side chock aft of the roller and aft of the forward port post of the bow pulpit.

I used the same epoxy mix for a backing pad along with some 1/4" marine plywood pieces. I filled the toerail from below. Some large fender washers were used at each bolt.

If I can remember I'll take a picture of it this weekend.