Glass boat transdeucers...Wire Conn...
I have mounted transdeucers in the bilge as suggested but I used silicone sealant and it was easy and worked as good as a stern mount.
As to the wire connections more is better I must say that of all the items listed for durability I would make a case for the "Liquid Electric Tape" as the number one item to use. I have actually had better luck with crimp on connectors and liquid electrical tape than I have with solder and shrink wraps. I no that coils of wire may appear unsightly but if you cut things too short to remove and adjust you will be dissappointed down the road.