I dont know anything about the wireless depthfinders personally, but you do have a few other options if you dont want to drill holes in your boat.
1) get a "thru the hull" transducer. Its just what it sounds like. you mount it to the inside of your boat on the bottom and it can shoot its sonor thru the metal floor. that you would have to buy that special transducer seperatly though and i dont know how much they cost.
2) they sell transducer mounts that clamp on to the transom (or atleast you fasten them to the boat above the water line) and a metal rod projects down into the water in which your transducer is attached to.
When i bought my jon boat, the guy who i bought it from had a depthfinder, old old humminbird which i replaced, when i took off his transducer mounting bracket, the boat looked like swiss cheese, so he must have drilled 4 times and measured once! lol. But, i got me some small squares of aluminum about 4" x 4" and siliconed those on both sides of the transom covering the holes, then i mounted my new transducer bracket to that. I used rubber backed washers and lock nuts and was very neat, but very liberal with the silicone. looks very clean and water tight.
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