I actually have not yet used the DR on the pontoon, as I prefer to jig for deep water Mackinaw.
But regarding the sonar mounting.. man, fishfindermounts.com They’re amazing. (Also have proprietary battery 5 milli amp/hour and 10 mil amp/hour, charging system and wiring.
They have mounts for float tube/pontoon boat, canoe/kayak, Pram, and anything that floats. The transducer mount for float tube/pontoon, has a nifty quick release that lets you swing it upward during launching so that in shallow water you don’t dredge the bottom with the transducer.
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