RE: making your own hotspot
On the PFBC website there are maps of artificial structures placed in lakes enrolled in the Adopt-a-Lake program are available. Structures include porcupine cribs, nesting structures, catfish boxes, rock rubble piles, etc. If I remember correctly, navigate to the habitat section, and then to Adopt-a-Lake. Let me know if that doesn't work, I'll find it for you.