FHM spawn on the underside of things. Pallets, lily pads, etc., etc. Usually in water that is relatively shallow, probably due to predators in the pond.

A male will stake out a territory that is about 18" square.

If the male can't see his "neighbor" then their territories can be smaller.

They'll utilize anything, but I've noticed that it should stay in one place and not float all over the pond.

I've cut up pieces of foam and tethered them in place with a rope and a brick, cut sections of 3" dia foam core PVC 12" long or so and tied them together (found that they float so I used 3" dia regular PVC every 2nd or 3rd piece to give it some weight), threw pallets in shallow areas (less than 24" deep), etc. etc.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).