1) Remove the suction cup.
2) Run the transducer line along whichever side you mount the head.
3) Fasten line to thwarts, bow seat with zip ties.
4) Run line all the way forward to bow bulkhead and use silicone caulk to make a 'puddle', making sure you have no air bubbles.
5) Imbed transducer in caulk, and let cure for a day or two, before moving canoe.
6) Carefully portage canoe to nearest body of water for a test paddle. (If you live farther from a body of water than I do, you may want to load it up and drive.)

This is a 'permanent' mount that can be removed by cutting the silicone (harder than it sounds).